add simple quote message context menu

add hacky way to load encrypted tox saves
limit fps to 60 and disable imgui demo window
2023-09-01 21:13:36 +02:00 · 2023-08-28 15:33:36 +02:00 · 2023-08-28 14:06:27 +02:00 · 2023-08-20 12:50:58 +02:00 · 2023-08-19 21:42:47 +02:00 · 2023-08-12 20:17:29 +02:00
3567 changed files with 1100341 additions and 29446 deletions
--- a/.circleci/bazel-test
+++ b/.circleci/bazel-test
@ -1,12 +0,0 @@
-#!/bin/sh
-
-set -eux
-
-git submodule update --init --recursive
-/src/workspace/tools/inject-repo c-toxcore
-# TODO(iphydf): Re-enable fuzz-test when https://github.com/tweag/rules_nixpkgs/issues/442 is fixed.
-cd /src/workspace && bazel test -k \
-  --build_tag_filters=-haskell,-fuzz-test \
-  --test_tag_filters=-haskell,-fuzz-test \
-  -- \
-  "$@"
--- a/.cirrus.yml
+++ b/.cirrus.yml
@ -1,79 +0,0 @@
---
-bazel-opt_task:
-  container:
-    image: toxchat/toktok-stack:latest-release
-    cpu: 2
-    memory: 2G
-  configure_script:
-    - git submodule update --init --recursive
-    - /src/workspace/tools/inject-repo c-toxcore
-    - sed -i -e 's/build --config=remote/#&/' /src/workspace/.bazelrc.local
-  test_all_script:
-    - cd /src/workspace && bazel test -k
-        --build_tag_filters=-haskell
-        --test_tag_filters=-haskell
-        --
-        //c-toxcore/...
-        -//c-toxcore/auto_tests:tcp_relay_test # Cirrus doesn't allow external network connections.
-
-bazel-dbg_task:
-  container:
-    image: toxchat/toktok-stack:latest-debug
-    cpu: 2
-    memory: 2G
-  configure_script:
-    - git submodule update --init --recursive
-    - /src/workspace/tools/inject-repo c-toxcore
-  test_all_script:
-    - cd /src/workspace && bazel test -k
-        --build_tag_filters=-haskell
-        --test_tag_filters=-haskell
-        --remote_http_cache=http://$CIRRUS_HTTP_CACHE_HOST
-        --
-        //c-toxcore/...
-        -//c-toxcore/auto_tests:tcp_relay_test # Cirrus doesn't allow external network connections.
-
-cimple_task:
-  container:
-    image: toxchat/toktok-stack:latest-release
-    cpu: 2
-    memory: 4G
-  configure_script:
-    - git submodule update --init --recursive
-    - /src/workspace/tools/inject-repo c-toxcore
-    - sed -i -e 's/build --config=remote/#&/' /src/workspace/.bazelrc.local
-  test_all_script:
-    - cd /src/workspace && bazel test -k
-        --build_tag_filters=haskell
-        --test_tag_filters=haskell
-        --
-        //c-toxcore/...
-
-freebsd_task:
-  freebsd_instance:
-    image_family: freebsd-14-0
-  configure_script:
-    - PAGER=cat ASSUME_ALWAYS_YES=YES pkg install
-        cmake
-        git
-        gmake
-        googletest
-        libconfig
-        libsodium
-        libvpx
-        opus
-        pkgconf
-    - git submodule update --init --recursive
-  test_all_script:
-    - |
-      # TODO(iphydf): Investigate FreeBSD failures on these tests.
-      sed -Ei -e '/\(dht_getnodes_api\)/s/^/#/' auto_tests/CMakeLists.txt
-      cmake . \
-        -DMIN_LOGGER_LEVEL=TRACE \
-        -DMUST_BUILD_TOXAV=ON \
-        -DNON_HERMETIC_TESTS=OFF \
-        -DTEST_TIMEOUT_SECONDS=50 \
-        -DUSE_IPV6=OFF \
-        -DAUTOTEST=ON
-      cmake --build . --target install
-      ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6
--- a/.clang-tidy
+++ b/.clang-tidy
@ -1,49 +0,0 @@
-# vim:ft=yaml
-HeaderFilterRegex: "/c-toxcore/[^/]+/[^.].+"
-CheckOptions:
-  - key:             readability-identifier-naming.ClassCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.ConstantCase
-    value:           lower_case
-  # bootstrap-daemon has these.
-  - key:             readability-identifier-naming.ConstantIgnoredRegexp
-    value:           "^NAME_.*"
-  - key:             readability-identifier-naming.EnumCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.EnumConstantCase
-    value:           UPPER_CASE
-  - key:             readability-identifier-naming.FunctionCase
-    value:           lower_case
-  - key:             readability-identifier-naming.GlobalConstantCase
-    value:           lower_case
-  - key:             readability-identifier-naming.MemberCase
-    value:           lower_case
-  - key:             readability-identifier-naming.MacroDefinitionCase
-    value:           UPPER_CASE
-  - key:             readability-identifier-naming.MacroDefinitionIgnoredRegexp
-    value:           "^_.*|bitwise|force|nullable|non_null|nullptr|static_assert|ck_.*"
-  - key:             readability-identifier-naming.ParameterCase
-    value:           lower_case
-  - key:             readability-identifier-naming.StructCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.TypedefCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.TypedefIgnoredRegexp
-    value:           ".*_cb"
-  - key:             readability-identifier-naming.UnionCase
-    value:           Camel_Snake_Case
-  - key:             readability-identifier-naming.VariableCase
-    value:           lower_case
-
-  - key:             llvmlibc-restrict-system-libc-headers.Includes
-    value:           "alloca.h,arpa/inet.h,assert.h,ctype.h,errno.h,fcntl.h,getopt.h,libconfig.h,limits.h,linux/if.h,math.h,netdb.h,netinet/in.h,opus.h,pthread.h,signal.h,sodium/crypto_scalarmult_curve25519.h,sodium.h,sodium/randombytes.h,stdarg.h,stdbool.h,stddef.h,stdint.h,stdio.h,stdlib.h,string.h,sys/ioctl.h,syslog.h,sys/resource.h,sys/socket.h,sys/stat.h,sys/time.h,sys/types.h,time.h,unistd.h,vpx/vp8cx.h,vpx/vp8dx.h,vpx/vpx_decoder.h,vpx/vpx_encoder.h,vpx/vpx_image.h"
-  - key:             hicpp-signed-bitwise.IgnorePositiveIntegerLiterals
-    value:           true
-  - key:             concurrency-mt-unsafe.FunctionSet
-    value:           posix
-  - key:             readability-function-cognitive-complexity.Threshold
-    value:           153  # TODO(iphydf): Decrease. tox_new is the highest at the moment.
-  - key:             cppcoreguidelines-avoid-do-while.IgnoreMacros
-    value:           true
-  - key:             readability-simplify-boolean-expr.SimplifyDeMorgan
-    value:           false
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@ -1,11 +0,0 @@
-{
-	"image": "mcr.microsoft.com/devcontainers/universal:2",
-	"features": {
-		"ghcr.io/devcontainers-contrib/features/bash-command:1": {
-			"command": "git submodule update --init --recursive"
-		},
-		"ghcr.io/devcontainers-contrib/features/apt-packages:1": {
-			"packages": "libconfig-dev,libopus-dev,libvpx-dev,ninja-build"
-		}
-	}
-}
--- a/.dockerignore
+++ b/.dockerignore
@ -1,2 +0,0 @@
-/_build
-/_install
--- a/.github/scripts/cmake-alpine-s390x
+++ b/.github/scripts/cmake-alpine-s390x
@ -1,55 +0,0 @@
-#!/bin/bash
-# Copyright (C) 2018-2023 nurupo
-
-# Toxcore building
-
-set -eux
-
-cd .. # /work
-. cmake-alpine-run.sh
-
-# === Get VM ready to build the code ===
-
-start_vm
-
-RUN apk add cmake g++ ninja
-
-mv c-toxcore /
-
-# Copy over toxcore code from host to qemu
-scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -P "$SSH_PORT" -r /c-toxcore root@localhost:~
-
-cd /c-toxcore
-. ".github/scripts/flags-gcc.sh"
-
-# Make compilation error on a warning
-add_flag -Werror
-
-# - disabling toxav because vpx doesn't work on s390x.
-# - disabling bootstrap daemons because we don't need them for testing (saving time).
-# - disabling shared libraries because it saves a lot of time on building PIC objects.
-# - enable unity build because it saves a lot of time as well (fewer objects to build).
-RUN "cmake -B_build -Hc-toxcore -GNinja \
-  -DCMAKE_C_FLAGS='$C_FLAGS' \
-  -DCMAKE_CXX_FLAGS='$CXX_FLAGS' \
-  -DCMAKE_EXE_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_SHARED_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_INSTALL_PREFIX:PATH='_install' \
-  -DCMAKE_UNITY_BUILD=ON \
-  -DMIN_LOGGER_LEVEL=TRACE \
-  -DNON_HERMETIC_TESTS=ON \
-  -DENABLE_SHARED=OFF \
-  -DBUILD_TOXAV=OFF \
-  -DDHT_BOOTSTRAP=OFF \
-  -DBOOTSTRAP_DAEMON=OFF \
-  -DSTRICT_ABI=ON \
-  -DTEST_TIMEOUT_SECONDS=90 \
-  -DUSE_IPV6=OFF \
-  -DAUTOTEST=ON"
-
-RUN 'cmake --build _build --parallel 2 --target install -- -k 0'
-RUN 'cd _build && ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:1 --timeout 90 || true' &
-
-# Give the tests 5 minutes to run. Sometimes, the per-test timeout doesn't
-# work, so we put a global timeout here for everything.
-sleep 300
--- a/.github/scripts/cmake-freebsd
+++ b/.github/scripts/cmake-freebsd
@ -1,58 +0,0 @@
-#!/bin/bash
-# Copyright (C) 2018-2023 nurupo
-
-# Toxcore building
-
-set -eux
-
-cd .. # /work
-. cmake-freebsd-run.sh
-
-# === Get VM ready to build the code ===
-
-# Unpack image only if it's compressed.
-if [ -f "$IMAGE_NAME.gz" ]; then
-  gunzip "$IMAGE_NAME.gz"
-fi
-
-mv c-toxcore /
-
-start_vm
-
-# Copy over toxcore code from host to qemu
-scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no -P "$SSH_PORT" -r /c-toxcore root@localhost:~
-
-RUN ls -lh
-
-cd /c-toxcore
-. '.github/scripts/flags-clang.sh'
-
-add_ld_flag -Wl,-z,defs
-
-# Make compilation error on a warning.
-add_flag -Werror
-
-# This triggers on FreeBSD's clang.
-add_flag -Wno-format
-add_flag -Wno-unsafe-buffer-usage
-
-RUN "cmake -B_build -Hc-toxcore \
-  -DCMAKE_C_FLAGS='$C_FLAGS' \
-  -DCMAKE_CXX_FLAGS='$CXX_FLAGS' \
-  -DCMAKE_EXE_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_SHARED_LINKER_FLAGS='$LD_FLAGS' \
-  -DCMAKE_INSTALL_PREFIX:PATH='_install' \
-  -DMIN_LOGGER_LEVEL=TRACE \
-  -DMUST_BUILD_TOXAV=ON \
-  -DNON_HERMETIC_TESTS=ON \
-  -DSTRICT_ABI=ON \
-  -DTEST_TIMEOUT_SECONDS=120 \
-  -DUSE_IPV6=OFF \
-  -DAUTOTEST=ON"
-
-# We created the VM with the same number of cores as the host, so the host-ran `nproc` here is fine.
-RUN 'cmake --build _build --parallel "$NPROC" --target install -- -k'
-RUN 'cd _build && ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:2 --timeout 120 || true'
-
-# Gracefully shut down the VM.
-stop_vm
--- a/.github/workflows/cd.yml
+++ b/.github/workflows/cd.yml
@ -0,0 +1,43 @@
+name: ContinuousDelivery
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  BUILD_TYPE: Release
+
+jobs:
+  windows:
+    timeout-minutes: 15
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive
+
+    - name: Install Dependencies
+      run: vcpkg install libsodium:x64-windows-static pthreads:x64-windows-static
+
+    # setup vs env
+    - uses: ilammy/msvc-dev-cmd@v1
+      with:
+        arch: amd64
+
+    - name: Configure CMake
+      run: cmake -G Ninja -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows-static
+
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4
+
+    - uses: actions/upload-artifact@v3
+      with:
+        name: windows_msvc_x86-64
+        # TODO: do propper packing
+        path: |
+          ${{github.workspace}}/build/bin/
+
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -1,200 +1,74 @@
-name: ci
+name: ContinuousIntegration

 on:
+  push:
+    branches: [ master ]
  pull_request:
-    branches: [master]
+    branches: [ master ]

-# Cancel old PR builds when pushing new commits.
-concurrency:
-  group: build-${{ github.event.pull_request.number || github.ref }}
-  cancel-in-progress: true
+env:
+  BUILD_TYPE: Debug

 jobs:
-  common:
-    uses: TokTok/ci-tools/.github/workflows/common-ci.yml@master
+  linux:
+    timeout-minutes: 10

-  analysis:
-    strategy:
-      fail-fast: false
-      matrix:
-        tool: [autotools, clang-tidy, compcert, cppcheck, doxygen, goblint, infer, freebsd, misra, modules, pkgsrc, rpm, slimcc, sparse, tcc, tokstyle]
    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        with:
-          driver: docker
-      - name: Build toxchat/c-toxcore:sources
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/sources/sources.Dockerfile
-          tags: toxchat/c-toxcore:sources
-      - name: Docker Build
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/${{ matrix.tool }}/${{ matrix.tool }}.Dockerfile

-  coverage-linux:
-    runs-on: ubuntu-latest
    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Build, test, and upload coverage
-        run: other/docker/coverage/run
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive

-  generate-events:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Run generate_event_c
-        run: |
-          other/event_tooling/run
-          git diff --exit-code
+    - name: Install Dependencies
+      run: sudo apt update && sudo apt -y install libsodium-dev

-  cimplefmt:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Run cimplefmt
-        run: other/docker/cimplefmt/run -u $(find tox* -name "*.[ch]")
+    - name: Configure CMake
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}

-  build-android:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - run: .github/scripts/cmake-android armeabi-v7a
-      - run: .github/scripts/cmake-android arm64-v8a
-      - run: .github/scripts/cmake-android x86
-      - run: .github/scripts/cmake-android x86_64
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4
+
+  macos:
+    timeout-minutes: 10

-  build-macos:
    runs-on: macos-latest
+
    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Build and test
-        run: .github/scripts/cmake-osx
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive
+
+    - name: Install Dependencies
+      run: brew install libsodium
+
+    - name: Configure CMake
+      run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
+
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4
+
+  windows:
+    timeout-minutes: 10
+
+    runs-on: windows-latest

-  build-windows-msvc:
-    strategy:
-      matrix:
-        version: [2019, 2022]
-    runs-on: windows-${{ matrix.version }}
-    env:
-      VCPKG_ROOT: "C:/vcpkg"
-      VCPKG_BINARY_SOURCES: "clear;x-gha,readwrite"
    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Export GitHub Actions cache environment variables
-        uses: actions/github-script@v7
-        with:
-          script: |
-            core.exportVariable('ACTIONS_CACHE_URL', process.env.ACTIONS_CACHE_URL || '');
-            core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env.ACTIONS_RUNTIME_TOKEN || '');
-      - name: Configure CMake
-        run: cmake --preset windows-default
-      - name: Build
-        run: cmake --build _build -j $([int]$env:NUMBER_OF_PROCESSORS+2)
-      - name: Test
-        run: |
-          cd _build
-          ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6 --build-config Debug
+    - uses: actions/checkout@v3
+      with:
+        submodules: recursive

-  build-netbsd:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Test in NetBSD
-        id: test
-        uses: vmactions/netbsd-vm@v1
-        with:
-          usesh: true
-          copyback: false
-          prepare:
-            /usr/sbin/pkg_add
-              cmake
-              googletest
-              libconfig
-              libopus
-              libsodium
-              libvpx
-              pkg-config
+    - name: Install Dependencies
+      run: vcpkg install libsodium:x64-windows-static pthreads:x64-windows-static

-          run: |
-            # TODO(iphydf): Investigate NetBSD failures on these tests.
-            sed -Ei -e '/\((TCP|dht_getnodes_api)\)/s/^/#/' auto_tests/CMakeLists.txt
-            cmake . \
-              -DMIN_LOGGER_LEVEL=TRACE \
-              -DMUST_BUILD_TOXAV=ON \
-              -DNON_HERMETIC_TESTS=ON \
-              -DTEST_TIMEOUT_SECONDS=90 \
-              -DUSE_IPV6=OFF \
-              -DAUTOTEST=ON
-            cmake --build . --target install
-            ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6
+    # setup vs env
+    - uses: ilammy/msvc-dev-cmd@v1
+      with:
+        arch: amd64

-  build-freebsd:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Test in FreeBSD
-        id: test
-        uses: vmactions/freebsd-vm@v1
-        with:
-          usesh: true
-          copyback: false
-          prepare:
-            PAGER=cat ASSUME_ALWAYS_YES=YES pkg install
-              cmake
-              git
-              gmake
-              googletest
-              libconfig
-              libsodium
-              libvpx
-              opus
-              pkgconf
+    - name: Configure CMake
+      run: cmake -G Ninja -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows-static

-          run: |
-            # TODO(iphydf): Investigate FreeBSD failures on these tests.
-            sed -Ei -e '/\(dht_getnodes_api\)/s/^/#/' auto_tests/CMakeLists.txt
-            cmake . \
-              -DMIN_LOGGER_LEVEL=TRACE \
-              -DMUST_BUILD_TOXAV=ON \
-              -DNON_HERMETIC_TESTS=ON \
-              -DTEST_TIMEOUT_SECONDS=50 \
-              -DUSE_IPV6=OFF \
-              -DAUTOTEST=ON
-            cmake --build . --target install
-            ctest -j50 --output-on-failure --rerun-failed --repeat until-pass:6
+    - name: Build
+      run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}} -j 4

-  mypy:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          submodules: recursive
-      - name: Set up Python 3.9
-        uses: actions/setup-python@v5
-        with:
-          python-version: 3.9
-      - name: Install mypy
-        run: pip install mypy
-      - name: Run mypy
-        run: |
-          (find . -name "*.py" -and -not -name "conanfile.py"; grep -lR '^#!.*python') \
-              | xargs -n1 -P8 mypy --strict
--- a/.github/workflows/post-submit.yml
+++ b/.github/workflows/post-submit.yml
@ -1,43 +0,0 @@
-name: post-submit
-
-on:
-  push:
-    branches: [master]
-
-jobs:
-  build-alpine-s390x:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-      - name: Docker Build
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/alpine-s390x/Dockerfile
-
-  docker-coverage:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-        with:
-          driver: docker
-      - name: Login to DockerHub
-        if: ${{ github.event_name == 'push' }}
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Build toxchat/c-toxcore:sources
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/sources/sources.Dockerfile
-          tags: toxchat/c-toxcore:sources
-      - name: Build and push
-        uses: docker/build-push-action@v5
-        with:
-          file: other/docker/coverage/coverage.Dockerfile
-          push: ${{ github.event_name == 'push' }}
-          tags: toxchat/c-toxcore:coverage
-          cache-from: type=registry,ref=toxchat/c-toxcore:coverage
-          cache-to: type=inline
--- a/.gitignore
+++ b/.gitignore
@ -1,101 +1,22 @@
-# OS files
-.DS_Store
-.DS_Store?
-._*
-.mypy_cache
-.Spotlight-V100
-.Trash*
-Icon?
-ethumbs.db
-Thumbs.db
-*.tmp
-
-# Make
-/_build
-/_install
-/tox-0.0.0*
-/.vs
-/CppProperties.json
-CMakeCache.txt
-CMakeFiles
-Makefile
-!/other/rpm/Makefile
-cmake_install.cmake
-install_manifest.txt
-tags
-Makefile.in
-CMakeLists.txt.user
-DartConfiguration.tcl
-CTestTestfile.cmake
-*.pc
-
-# Testing
-/amalgamation.*
-testing/data
-*~
-
-# Vim
-*.swp
-
-# Object files
+.vs/
 *.o
-*.lo
-*.a
-
-# Executables
-*.exe
-*.out
-*.app
-*.la
-
-# Libraries
-*.so
-
-# Misc (?)
-m4/*
-configure
-configure_aux
-!m4/pkg.m4
-aclocal.m4
-config.h*
-config.log
-config.status
-stamp-h1
-autom4te.cache
-libtool
-.deps
-.libs
-.dirstamp
-build/
-*.nvim*
-*.vim*
-
-# kdevelop
-.kdev/
-*.kdev*
-
-# VScode
-.vscode/
-
-# Netbeans
-nbproject
-
-# astyle
-*.orig
-
-# Android buildscript
-android-toolchain-*
-toxcore-android-*
-
-# cscope files list
-cscope.files
-
-# rpm
-tox.spec
-
-# clangd
-.cache/
-compile_commands.json
-
-/infer
+*.swp
+~*
+*~
 .idea/
+cmake-build-debug/
+cmake-build-debugandtest/
+cmake-build-release/
+*.stackdump
+*.coredump
+compile_commands.json
+/build*
+.clangd
+.cache
+
+.DS_Store
+.AppleDouble
+.LSOverride
+
+CMakeLists.txt.user*
+CMakeCache.txt
--- a/.gitmodules
+++ b/.gitmodules
@ -1,3 +1,22 @@
-[submodule "third_party/cmp"]
-	path = third_party/cmp
-	url = https://github.com/camgunz/cmp
+[submodule "external/toxcore/c-toxcore/third_party/cmp"]
+	path = external/toxcore/c-toxcore/third_party/cmp
+	url = https://github.com/camgunz/cmp.git
+	shallow = true
+[submodule "external/solanaceae_toxcore"]
+	path = external/solanaceae_toxcore
+	url = https://github.com/Green-Sky/solanaceae_toxcore.git
+[submodule "external/solanaceae_util"]
+	path = external/solanaceae_util
+	url = https://github.com/Green-Sky/solanaceae_util.git
+[submodule "external/solanaceae_contact"]
+	path = external/solanaceae_contact
+	url = https://github.com/Green-Sky/solanaceae_contact.git
+[submodule "external/solanaceae_message3"]
+	path = external/solanaceae_message3
+	url = https://github.com/Green-Sky/solanaceae_message3.git
+[submodule "external/solanaceae_tox"]
+	path = external/solanaceae_tox
+	url = https://github.com/Green-Sky/solanaceae_tox.git
+[submodule "external/solanaceae_plugin"]
+	path = external/solanaceae_plugin
+	url = https://github.com/Green-Sky/solanaceae_plugin.git
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -1,610 +1,52 @@
-################################################################################
-#
-# The main toxcore CMake build file.
-#
-# This file when processed with cmake produces:
-# - A number of small libraries (.a/.so/...) containing independent components
-#   of toxcore. E.g. the DHT has its own library, and the system/network
-#   abstractions are in their own library as well. These libraries are not
-#   installed on `make install`. The toxav, and toxencryptsave libraries are
-#   also not installed.
-# - A number of small programs, statically linked if possible.
-# - One big library containing all of the toxcore, toxav, and toxencryptsave
-#   code.
-#
-################################################################################
+cmake_minimum_required(VERSION 3.9 FATAL_ERROR)

-cmake_minimum_required(VERSION 3.16)
-cmake_policy(VERSION 3.16)
-project(toxcore)
+# cmake setup begin
+project(tomato)

-list(APPEND CMAKE_MODULE_PATH ${toxcore_SOURCE_DIR}/cmake)
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)

-option(FLAT_OUTPUT_STRUCTURE "Whether to produce output artifacts in ${CMAKE_BINARY_DIR}/{bin,lib}" OFF)
-if(FLAT_OUTPUT_STRUCTURE)
-  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
-  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
+# defaulting to debug mode, if not specified
+if(NOT CMAKE_BUILD_TYPE)
+	set(CMAKE_BUILD_TYPE "Debug")
 endif()

-set_source_files_properties(
-  toxcore/mono_time.c
-  toxcore/network.c
-  toxcore/tox.c
-  toxcore/util.c
-  PROPERTIES SKIP_UNITY_BUILD_INCLUSION TRUE)
+# setup my vim ycm :D
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

-################################################################################
-#
-# :: Version management
-#
-################################################################################
+# more paths
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib")
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")

-# This version is for the entire project. All libraries (core, av, ...) move in
-# versions in a synchronised way.
-set(PROJECT_VERSION_MAJOR "0")
-set(PROJECT_VERSION_MINOR "2")
-set(PROJECT_VERSION_PATCH "19")
-set(PROJECT_VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")
+# external libs
+add_subdirectory(./external) # before increasing warn levels, sad :(

-# set .so library version / following libtool scheme
-# https://www.gnu.org/software/libtool/manual/libtool.html#Updating-version-info
-file(STRINGS ${toxcore_SOURCE_DIR}/so.version SOVERSION_CURRENT REGEX "^CURRENT=[0-9]+$")
-string(SUBSTRING "${SOVERSION_CURRENT}" 8 -1 SOVERSION_CURRENT)
-file(STRINGS ${toxcore_SOURCE_DIR}/so.version SOVERSION_REVISION REGEX "^REVISION=[0-9]+$")
-string(SUBSTRING "${SOVERSION_REVISION}" 9 -1 SOVERSION_REVISION)
-file(STRINGS ${toxcore_SOURCE_DIR}/so.version SOVERSION_AGE REGEX "^AGE=[0-9]+$")
-string(SUBSTRING "${SOVERSION_AGE}" 4 -1 SOVERSION_AGE)
-# account for some libtool magic, see other/version-sync script for details
-math(EXPR SOVERSION_MAJOR ${SOVERSION_CURRENT}-${SOVERSION_AGE})
-set(SOVERSION "${SOVERSION_MAJOR}.${SOVERSION_AGE}.${SOVERSION_REVISION}")
-message("SOVERSION: ${SOVERSION}")
-
-################################################################################
-#
-# :: Dependencies and configuration
-#
-################################################################################
-
-include(CTest)
-include(ModulePackage)
-include(StrictAbi)
-include(GNUInstallDirs)
-
-if(APPLE)
-  include(MacRpath)
-endif()
-
-enable_testing()
-find_package(GTest)
-
-set(CMAKE_MACOSX_RPATH ON)
-
-# Set standard version for compiler.
-if(MSVC AND MSVC_TOOLSET_VERSION LESS 143)
-  # https://developercommunity.visualstudio.com/t/older-winsdk-headers-are-incompatible-with-zcprepr/1593479
-  set(CMAKE_C_STANDARD 99)
-else()
-  set(CMAKE_C_STANDARD 11)
-endif()
-set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_C_EXTENSIONS OFF)
 set(CMAKE_CXX_EXTENSIONS OFF)

-message(STATUS "Supported C compiler features = ${CMAKE_C_COMPILE_FEATURES}")
-message(STATUS "Supported C++ compiler features = ${CMAKE_CXX_COMPILE_FEATURES}")
+# bump up warning levels appropriately for clang, gcc & msvc
+if (${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU" OR ${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
+	add_compile_options(
+		-Wall -Wextra # Reasonable and standard
+		-Wpedantic # Warn if non-standard C++ is used
+		-Wunused # Warn on anything being unused
+		#-Wconversion # Warn on type conversions that may lose data
+		#-Wsign-conversion # Warn on sign conversions
+		-Wshadow # Warn if a variable declaration shadows one from a parent context
+	)

-# Enable some warnings if we know the compiler.
-if(MSVC)
-  add_compile_options(/W4 /analyze)
-  add_compile_options(/wd4100)  # unreferenced formal parameter
-  add_compile_options(/wd4267)  # narrowing conversion
-  add_compile_options(/wd4244)  # narrowing conversion
-  add_compile_options(/wd4127)  # conditional expression is constant
-  add_compile_options(/wd4995)  # #pragma deprecated
-  add_compile_options(/wd4018)  # signed/unsigned compare
-  add_compile_options(/wd4310)  # cast truncates constant value
-  add_compile_options(/wd4389)  # signed/unsigned compare
-  add_compile_options(/wd4245)  # signed/unsigned assign/return/function call
-  add_compile_options(/wd4200)  # nonstandard extension used: zero-sized array in struct/union
-  add_compile_options(/wd4702)  # unreachable code
-  add_compile_options(/wd6340)  # unsigned int passed to signed parameter
-  add_compile_options(/wd6326)  # potential comparison of a constant with another constant
-
-  # TODO(iphydf): Look into these
-  add_compile_options(/wd4996)  # use WSAAddressToStringW() instead of WSAAddressToStringA()
-  add_compile_options(/wd6255)  # don't use alloca
-  add_compile_options(/wd6385)  # reading invalid data
-  add_compile_options(/wd6001)  # using uninitialized memory
-  add_compile_options(/wd6101)  # returning uninitialized memory
-  add_compile_options(/wd6386)  # buffer overrun
-  add_compile_options(/wd6011)  # NULL dereference
-  add_compile_options(/wd6031)  # sscanf return value ignored
-  add_compile_options(/wd6387)  # passing NULL to fwrite
+	if (NOT WIN32)
+		#link_libraries(-fsanitize=address,undefined)
+		#link_libraries(-fsanitize=undefined)
+	endif()
+elseif (${CMAKE_CXX_COMPILER_ID} STREQUAL "MSVC")
+	if (CMAKE_CXX_FLAGS MATCHES "/W[0-4]")
+		string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+	else()
+		set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4")
+	endif()
 endif()

-set(MIN_LOGGER_LEVEL "" CACHE STRING "Logging level to use (TRACE, DEBUG, INFO, WARNING, ERROR)")
-if(MIN_LOGGER_LEVEL)
-  if(("${MIN_LOGGER_LEVEL}" STREQUAL "TRACE") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "DEBUG") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "INFO") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "WARNING") OR
-     ("${MIN_LOGGER_LEVEL}" STREQUAL "ERROR"))
-    add_definitions(-DMIN_LOGGER_LEVEL=LOGGER_LEVEL_${MIN_LOGGER_LEVEL})
-  else()
-    message(FATAL_ERROR "Unknown value provided for MIN_LOGGER_LEVEL: \"${MIN_LOGGER_LEVEL}\", must be one of TRACE, DEBUG, INFO, WARNING or ERROR")
-  endif()
-endif()
+# cmake setup end

-option(EXPERIMENTAL_API "Install experimental header file with unstable API" OFF)
+add_subdirectory(./src)

-option(USE_IPV6 "Use IPv6 in tests" ON)
-if(NOT USE_IPV6)
-  add_definitions(-DUSE_IPV6=0)
-endif()
-
-option(BUILD_MISC_TESTS "Build additional tests" OFF)
-option(BUILD_FUN_UTILS "Build additional just for fun utilities" OFF)
-
-option(UNITTEST "Enable unit tests (disable if you don't have a working gmock or gtest)" ON)
-
-option(AUTOTEST "Enable autotests (mainly for CI)" OFF)
-if(AUTOTEST)
-  option(NON_HERMETIC_TESTS "Whether to build and run tests that depend on an internet connection" OFF)
-  option(PROXY_TEST "Enable proxy test (requires other/proxy/proxy_server.go to be running)" OFF)
-endif()
-
-option(BUILD_TOXAV "Whether to build the tox AV library" ON)
-option(MUST_BUILD_TOXAV "Fail the build if toxav cannot be built" OFF)
-
-option(DHT_BOOTSTRAP "Enable building of DHT_bootstrap" ON)
-option(BOOTSTRAP_DAEMON "Enable building of tox-bootstrapd" ON)
-if(BOOTSTRAP_DAEMON AND WIN32)
-  message(WARNING "Building tox-bootstrapd for Windows is not supported, disabling")
-  set(BOOTSTRAP_DAEMON OFF)
-endif()
-
-option(BUILD_FUZZ_TESTS "Build fuzzing harnesses" OFF)
-
-if(MSVC)
-  option(MSVC_STATIC_SODIUM "Whether to link libsodium statically for MSVC" OFF)
-  if(MSVC_STATIC_SODIUM)
-    add_definitions(-DSODIUM_STATIC=1)
-  endif()
-endif()
-
-include(Dependencies)
-
-if(MUST_BUILD_TOXAV)
-  set(NO_TOXAV_ERROR_TYPE SEND_ERROR)
-else()
-  set(NO_TOXAV_ERROR_TYPE WARNING)
-endif()
-
-if(BUILD_TOXAV)
-  if(NOT OPUS_FOUND)
-    message(${NO_TOXAV_ERROR_TYPE} "Option BUILD_TOXAV is enabled but required library OPUS was not found.")
-    set(BUILD_TOXAV OFF)
-  endif()
-  if(NOT VPX_FOUND)
-    message(${NO_TOXAV_ERROR_TYPE} "Option BUILD_TOXAV is enabled but required library VPX was not found.")
-    set(BUILD_TOXAV OFF)
-  endif()
-endif()
-
-# Disable float/double packing in CMP (C MessagePack library).
-# We don't transfer floats over the network, so we disable this functionality.
-add_definitions(-DCMP_NO_FLOAT=1)
-
-################################################################################
-#
-# :: Tox Core Library
-#
-################################################################################
-
-# toxcore_PKGCONFIG_LIBS is what's added to the Libs: line in toxcore.pc. It
-# needs to contain all the libraries a program using toxcore should link against
-# if it's statically linked. If it's dynamically linked, there is no need to
-# explicitly link against all the dependencies, but it doesn't harm much(*)
-# either.
-#
-# (*) It allows client code to use symbols from our dependencies without
-#    explicitly linking against them.
-set(toxcore_PKGCONFIG_LIBS)
-# Requires: in pkg-config file.
-set(toxcore_PKGCONFIG_REQUIRES)
-
-set(toxcore_SOURCES
-  third_party/cmp/cmp.c
-  third_party/cmp/cmp.h
-  toxcore/announce.c
-  toxcore/announce.h
-  toxcore/bin_pack.c
-  toxcore/bin_pack.h
-  toxcore/bin_unpack.c
-  toxcore/bin_unpack.h
-  toxcore/ccompat.c
-  toxcore/ccompat.h
-  toxcore/crypto_core.c
-  toxcore/crypto_core.h
-  toxcore/crypto_core_pack.c
-  toxcore/crypto_core_pack.h
-  toxcore/DHT.c
-  toxcore/DHT.h
-  toxcore/events/conference_connected.c
-  toxcore/events/conference_invite.c
-  toxcore/events/conference_message.c
-  toxcore/events/conference_peer_list_changed.c
-  toxcore/events/conference_peer_name.c
-  toxcore/events/conference_title.c
-  toxcore/events/dht_get_nodes_response.c
-  toxcore/events/events_alloc.c
-  toxcore/events/events_alloc.h
-  toxcore/events/file_chunk_request.c
-  toxcore/events/file_recv.c
-  toxcore/events/file_recv_chunk.c
-  toxcore/events/file_recv_control.c
-  toxcore/events/friend_connection_status.c
-  toxcore/events/friend_lossless_packet.c
-  toxcore/events/friend_lossy_packet.c
-  toxcore/events/friend_message.c
-  toxcore/events/friend_name.c
-  toxcore/events/friend_read_receipt.c
-  toxcore/events/friend_request.c
-  toxcore/events/friend_status.c
-  toxcore/events/friend_status_message.c
-  toxcore/events/friend_typing.c
-  toxcore/events/self_connection_status.c
-  toxcore/events/group_custom_packet.c
-  toxcore/events/group_custom_private_packet.c
-  toxcore/events/group_invite.c
-  toxcore/events/group_join_fail.c
-  toxcore/events/group_message.c
-  toxcore/events/group_moderation.c
-  toxcore/events/group_password.c
-  toxcore/events/group_peer_exit.c
-  toxcore/events/group_peer_join.c
-  toxcore/events/group_peer_limit.c
-  toxcore/events/group_peer_name.c
-  toxcore/events/group_peer_status.c
-  toxcore/events/group_privacy_state.c
-  toxcore/events/group_private_message.c
-  toxcore/events/group_self_join.c
-  toxcore/events/group_topic.c
-  toxcore/events/group_topic_lock.c
-  toxcore/events/group_voice_state.c
-  toxcore/forwarding.c
-  toxcore/forwarding.h
-  toxcore/friend_connection.c
-  toxcore/friend_connection.h
-  toxcore/friend_requests.c
-  toxcore/friend_requests.h
-  toxcore/group.c
-  toxcore/group_chats.c
-  toxcore/group_chats.h
-  toxcore/group_common.h
-  toxcore/group_connection.c
-  toxcore/group_connection.h
-  toxcore/group.h
-  toxcore/group_announce.c
-  toxcore/group_announce.h
-  toxcore/group_moderation.c
-  toxcore/group_moderation.h
-  toxcore/group_onion_announce.c
-  toxcore/group_onion_announce.h
-  toxcore/group_pack.c
-  toxcore/group_pack.h
-  toxcore/LAN_discovery.c
-  toxcore/LAN_discovery.h
-  toxcore/list.c
-  toxcore/list.h
-  toxcore/logger.c
-  toxcore/logger.h
-  toxcore/Messenger.c
-  toxcore/Messenger.h
-  toxcore/mem.c
-  toxcore/mem.h
-  toxcore/mono_time.c
-  toxcore/mono_time.h
-  toxcore/net_crypto.c
-  toxcore/net_crypto.h
-  toxcore/network.c
-  toxcore/network.h
-  toxcore/onion_announce.c
-  toxcore/onion_announce.h
-  toxcore/onion.c
-  toxcore/onion_client.c
-  toxcore/onion_client.h
-  toxcore/onion.h
-  toxcore/ping_array.c
-  toxcore/ping_array.h
-  toxcore/ping.c
-  toxcore/ping.h
-  toxcore/shared_key_cache.c
-  toxcore/shared_key_cache.h
-  toxcore/state.c
-  toxcore/state.h
-  toxcore/TCP_client.c
-  toxcore/TCP_client.h
-  toxcore/TCP_common.c
-  toxcore/TCP_common.h
-  toxcore/TCP_connection.c
-  toxcore/TCP_connection.h
-  toxcore/TCP_server.c
-  toxcore/TCP_server.h
-  toxcore/timed_auth.c
-  toxcore/timed_auth.h
-  toxcore/tox_api.c
-  toxcore/tox.c
-  toxcore/tox_dispatch.c
-  toxcore/tox_dispatch.h
-  toxcore/tox_event.c
-  toxcore/tox_event.h
-  toxcore/tox_events.c
-  toxcore/tox_events.h
-  toxcore/tox.h
-  toxcore/tox_private.c
-  toxcore/tox_private.h
-  toxcore/tox_pack.c
-  toxcore/tox_pack.h
-  toxcore/tox_unpack.c
-  toxcore/tox_unpack.h
-  toxcore/util.c
-  toxcore/util.h)
-if(TARGET unofficial-sodium::sodium)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} unofficial-sodium::sodium)
-else()
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${LIBSODIUM_LIBRARIES})
-  set(toxcore_LINK_DIRECTORIES ${toxcore_LINK_DIRECTORIES} ${LIBSODIUM_LIBRARY_DIRS})
-  set(toxcore_INCLUDE_DIRECTORIES ${toxcore_INCLUDE_DIRECTORIES} ${LIBSODIUM_INCLUDE_DIRS})
-  set(toxcore_COMPILE_OPTIONS ${toxcore_COMPILE_OPTIONS} ${LIBSODIUM_CFLAGS_OTHER})
-endif()
-set(toxcore_PKGCONFIG_REQUIRES ${toxcore_PKGCONFIG_REQUIRES} libsodium)
-set(toxcore_API_HEADERS
-  ${toxcore_SOURCE_DIR}/toxcore/tox.h^tox
-  ${toxcore_SOURCE_DIR}/toxcore/tox_events.h^tox
-  ${toxcore_SOURCE_DIR}/toxcore/tox_dispatch.h^tox)
-if(EXPERIMENTAL_API)
-  set(toxcore_API_HEADERS ${toxcore_API_HEADERS}
-    ${toxcore_SOURCE_DIR}/toxcore/tox_private.h^tox)
-endif()
-
-################################################################################
-#
-# :: Audio/Video Library
-#
-################################################################################
-
-if(BUILD_TOXAV)
-  set(toxcore_SOURCES ${toxcore_SOURCES}
-    toxav/audio.c
-    toxav/audio.h
-    toxav/bwcontroller.c
-    toxav/bwcontroller.h
-    toxav/groupav.c
-    toxav/groupav.h
-    toxav/msi.c
-    toxav/msi.h
-    toxav/ring_buffer.c
-    toxav/ring_buffer.h
-    toxav/rtp.c
-    toxav/rtp.h
-    toxav/toxav.c
-    toxav/toxav.h
-    toxav/toxav_old.c
-    toxav/video.c
-    toxav/video.h)
-  set(toxcore_API_HEADERS ${toxcore_API_HEADERS}
-    ${toxcore_SOURCE_DIR}/toxav/toxav.h^toxav)
-
-  if(MSVC)
-    set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} PkgConfig::OPUS PkgConfig::VPX)
-  else()
-    set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${OPUS_LIBRARIES} ${VPX_LIBRARIES})
-    set(toxcore_LINK_DIRECTORIES ${toxcore_LINK_DIRECTORIES} ${OPUS_LIBRARY_DIRS} ${VPX_LIBRARY_DIRS})
-    set(toxcore_INCLUDE_DIRECTORIES ${toxcore_INCLUDE_DIRECTORIES} ${OPUS_INCLUDE_DIRS} ${VPX_INCLUDE_DIRS})
-    set(toxcore_COMPILE_OPTIONS ${toxcore_COMPILE_OPTIONS} ${OPUS_CFLAGS_OTHER} ${VPX_CFLAGS_OTHER})
-  endif()
-  set(toxcore_PKGCONFIG_REQUIRES ${toxcore_PKGCONFIG_REQUIRES} opus vpx)
-endif()
-
-################################################################################
-#
-# :: Block encryption libraries
-#
-################################################################################
-
-set(toxcore_SOURCES ${toxcore_SOURCES}
-  toxencryptsave/toxencryptsave.c
-  toxencryptsave/toxencryptsave.h)
-set(toxcore_API_HEADERS ${toxcore_API_HEADERS}
-  ${toxcore_SOURCE_DIR}/toxencryptsave/toxencryptsave.h^tox)
-
-################################################################################
-#
-# :: System dependencies
-#
-################################################################################
-
-# These need to come after other dependencies, since e.g. libvpx may depend on
-# pthread, but doesn't list it in VPX_LIBRARIES. We're adding it here, after
-# any potential libvpx linking.
-message("CMAKE_THREAD_LIBS_INIT: ${CMAKE_THREAD_LIBS_INIT}")
-if(CMAKE_THREAD_LIBS_INIT)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} ${CMAKE_THREAD_LIBS_INIT})
-endif()
-
-if(NSL_LIBRARIES)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${NSL_LIBRARIES})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} -lnsl)
-endif()
-
-if(RT_LIBRARIES)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${RT_LIBRARIES})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} -lrt)
-endif()
-
-if(SOCKET_LIBRARIES)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} ${SOCKET_LIBRARIES})
-  set(toxcore_PKGCONFIG_LIBS ${toxcore_PKGCONFIG_LIBS} -lsocket)
-endif()
-
-if(TARGET PThreads4W::PThreads4W)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} PThreads4W::PThreads4W)
-elseif(TARGET Threads::Threads)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} Threads::Threads)
-endif()
-if(WIN32)
-  set(toxcore_LINK_LIBRARIES ${toxcore_LINK_LIBRARIES} iphlpapi ws2_32)
-endif()
-
-################################################################################
-#
-# :: All layers together in one library for ease of use
-#
-################################################################################
-
-# Create combined library from all the sources.
-if(ENABLE_SHARED)
-  add_library(toxcore_shared SHARED ${toxcore_SOURCES})
-  set_target_properties(toxcore_shared PROPERTIES OUTPUT_NAME toxcore)
-  target_link_libraries(toxcore_shared PRIVATE ${toxcore_LINK_LIBRARIES})
-  target_link_directories(toxcore_shared PUBLIC ${toxcore_LINK_DIRECTORIES})
-  target_include_directories(toxcore_shared SYSTEM PRIVATE ${toxcore_INCLUDE_DIRECTORIES})
-  target_compile_options(toxcore_shared PRIVATE ${toxcore_COMPILE_OPTIONS})
-endif()
-
-if(ENABLE_STATIC)
-  add_library(toxcore_static STATIC ${toxcore_SOURCES})
-  if(NOT MSVC)
-    set_target_properties(toxcore_static PROPERTIES OUTPUT_NAME toxcore)
-  endif()
-  target_link_libraries(toxcore_static PRIVATE ${toxcore_LINK_LIBRARIES})
-  target_link_directories(toxcore_static PUBLIC ${toxcore_LINK_DIRECTORIES})
-  target_include_directories(toxcore_static SYSTEM PRIVATE ${toxcore_INCLUDE_DIRECTORIES})
-  target_compile_options(toxcore_static PRIVATE ${toxcore_COMPILE_OPTIONS})
-endif()
-
-if(BUILD_FUZZ_TESTS)
-  add_library(toxcore_fuzz STATIC ${toxcore_SOURCES})
-  target_link_libraries(toxcore_fuzz PRIVATE ${toxcore_LINK_LIBRARIES})
-  target_link_directories(toxcore_fuzz PUBLIC ${toxcore_LINK_DIRECTORIES})
-  target_include_directories(toxcore_fuzz SYSTEM PRIVATE ${toxcore_INCLUDE_DIRECTORIES})
-  target_compile_options(toxcore_fuzz PRIVATE ${toxcore_COMPILE_OPTIONS})
-  target_compile_definitions(toxcore_fuzz PUBLIC "FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION")
-endif()
-
-# Make version script (on systems that support it) to limit symbol visibility.
-make_version_script(toxcore ${toxcore_API_HEADERS})
-
-# Generate pkg-config file, install library to "${CMAKE_INSTALL_LIBDIR}" and install headers to
-# "${CMAKE_INSTALL_INCLUDEDIR}/tox".
-install_module(toxcore DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/tox)
-
-################################################################################
-#
-# :: Unit tests: no networking, just pure function calls.
-#
-################################################################################
-
-add_library(test_util STATIC
-  toxcore/DHT_test_util.cc
-  toxcore/DHT_test_util.hh
-  toxcore/crypto_core_test_util.cc
-  toxcore/crypto_core_test_util.hh
-  toxcore/mem_test_util.cc
-  toxcore/mem_test_util.hh
-  toxcore/network_test_util.cc
-  toxcore/network_test_util.hh
-  toxcore/test_util.cc
-  toxcore/test_util.hh)
-
-function(unit_test subdir target)
-  add_executable(unit_${target}_test ${subdir}/${target}_test.cc)
-  target_link_libraries(unit_${target}_test PRIVATE test_util)
-  if(TARGET toxcore_static)
-    target_link_libraries(unit_${target}_test PRIVATE toxcore_static)
-  else()
-    target_link_libraries(unit_${target}_test PRIVATE toxcore_shared)
-  endif()
-  target_link_libraries(unit_${target}_test PRIVATE GTest::gtest GTest::gtest_main GTest::gmock)
-  set_target_properties(unit_${target}_test PROPERTIES COMPILE_FLAGS "${TEST_CXX_FLAGS}")
-  add_test(NAME ${target} COMMAND ${CROSSCOMPILING_EMULATOR} unit_${target}_test)
-  set_property(TEST ${target} PROPERTY ENVIRONMENT "LLVM_PROFILE_FILE=${target}.profraw")
-endfunction()
-
-# The actual unit tests follow.
-#
-if(UNITTEST AND TARGET GTest::gtest AND TARGET GTest::gmock)
-  unit_test(toxav ring_buffer)
-  unit_test(toxav rtp)
-  unit_test(toxcore DHT)
-  unit_test(toxcore bin_pack)
-  unit_test(toxcore crypto_core)
-  unit_test(toxcore group_announce)
-  unit_test(toxcore group_moderation)
-  unit_test(toxcore list)
-  unit_test(toxcore mem)
-  unit_test(toxcore mono_time)
-  unit_test(toxcore ping_array)
-  unit_test(toxcore test_util)
-  unit_test(toxcore tox)
-  unit_test(toxcore util)
-endif()
-
-add_subdirectory(testing)
-
-################################################################################
-#
-# :: Automated regression tests: create a tox network and run integration tests
-#
-################################################################################
-
-if(AUTOTEST)
-  add_subdirectory(auto_tests)
-endif()
-
-################################################################################
-#
-# :: Bootstrap daemon
-#
-################################################################################
-
-if(DHT_BOOTSTRAP)
-  add_executable(DHT_bootstrap
-    other/DHT_bootstrap.c
-    other/bootstrap_node_packets.c)
-  if(TARGET toxcore_static)
-    target_link_libraries(DHT_bootstrap PRIVATE toxcore_static)
-  else()
-    target_link_libraries(DHT_bootstrap PRIVATE toxcore_shared)
-  endif()
-  target_link_libraries(DHT_bootstrap PRIVATE misc_tools)
-  if(TARGET unofficial-sodium::sodium)
-    target_link_libraries(DHT_bootstrap PRIVATE unofficial-sodium::sodium)
-  endif()
-  if(TARGET PThreads4W::PThreads4W)
-    target_link_libraries(DHT_bootstrap PRIVATE PThreads4W::PThreads4W)
-  elseif(TARGET Threads::Threads)
-    target_link_libraries(DHT_bootstrap PRIVATE Threads::Threads)
-  endif()
-  install(TARGETS DHT_bootstrap RUNTIME DESTINATION bin)
-endif()
-
-if(BOOTSTRAP_DAEMON)
-  if(LIBCONFIG_FOUND)
-    add_subdirectory(other/bootstrap_daemon)
-  else()
-    message(WARNING "Option BOOTSTRAP_DAEMON is enabled but required library LIBCONFIG was not found.")
-    set(BOOTSTRAP_DAEMON OFF)
-  endif()
-endif()
-
-if(BUILD_FUN_UTILS)
-  add_subdirectory(other/fun)
-endif()
-
-if (BUILD_FUZZ_TESTS)
-  add_subdirectory(testing/fuzzing)
-endif()
--- a/CMakePresets.json
+++ b/CMakePresets.json
@ -1,21 +0,0 @@
-{
-    "version": 3,
-    "configurePresets": [
-        {
-            "name": "windows-default",
-            "binaryDir": "${sourceDir}/_build",
-            "cacheVariables": {
-                "ENABLE_SHARED": true,
-                "ENABLE_STATIC": true,
-                "AUTOTEST": true,
-                "BUILD_MISC_TESTS": true,
-                "BOOTSTRAP_DAEMON": false,
-                "MUST_BUILD_TOXAV": true,
-                "TEST_TIMEOUT_SECONDS": "60",
-                "CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS": true,
-                "CMAKE_COMPILE_WARNING_AS_ERROR": true,
-                "CMAKE_TOOLCHAIN_FILE": "$env{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
-            }
-        }
-    ]
-}
--- a/INSTALL.md
+++ b/INSTALL.md
@ -1,455 +0,0 @@
-# Installation instructions
-
-These instructions will guide you through the process of building and installing
-the toxcore library and its components, as well as getting already pre-built
-binaries.
-
-## Table of contents
-
- [Overview](#overview)
-  - [Components](#components)
-    - [Main](#main)
-    - [Secondary](#secondary)
- [Building](#building)
-  - [Requirements](#requirements)
-    - [Library dependencies](#library-dependencies)
-    - [Compiler requirements](#compiler-requirements)
-    - [Build system requirements](#build-system-requirements)
-  - [CMake options](#cmake-options)
-  - [Build process](#build-process)
-    - [Unix-like](#unix-like)
-    - [Windows](#windows)
-      - [Building on Windows host](#building-on-windows-host)
-        - [Microsoft Visual Studio's Developer Command Prompt](#microsoft-visual-studios-developer-command-prompt)
-        - [MSYS/Cygwin](#msyscygwin)
-      - [Cross-compiling from Linux](#cross-compiling-from-linux)
- [Pre-built binaries](#pre-built-binaries)
-  - [Linux](#linux)
-
-## Overview
-
-### Components
-
-#### Main
-
-This repository, although called `toxcore`, in fact contains several libraries
-besides `toxcore` which complement it, as well as several executables. However,
-note that although these are separate libraries, at the moment, when building
-the libraries, they are all merged into a single `toxcore` library. Here is the
-full list of the main components that can be built using the CMake, their
-dependencies and descriptions.
-
-| Name             | Type       | Dependencies                       | Platform       | Description                                                                                                                |
-| ---------------- | ---------- | ---------------------------------- | -------------- | -------------------------------------------------------------------------------------------------------------------------- |
-| `toxcore`        | Library    | libsodium, libm, libpthread, librt | Cross-platform | The main Tox library that provides the messenger functionality.                                                            |
-| `toxav`          | Library    | libtoxcore, libopus, libvpx        | Cross-platform | Provides audio/video functionality.                                                                                        |
-| `toxencryptsave` | Library    | libtoxcore, libsodium              | Cross-platform | Provides encryption of Tox profiles (savedata), as well as arbitrary data.                                                 |
-| `DHT_bootstrap`  | Executable | libtoxcore                         | Cross-platform | A simple DHT bootstrap node.                                                                                               |
-| `tox-bootstrapd` | Executable | libtoxcore, libconfig              | Unix-like      | Highly configurable DHT bootstrap node daemon (systemd, SysVinit, Docker).                                                 |
-| `cmp`            | Library    |                                    | Cross-platform | C implementation of the MessagePack serialization format. [https://github.com/camgunz/cmp](https://github.com/camgunz/cmp) |
-
-#### Secondary
-
-There are some programs that are not built by default which you might find
-interesting. You need to pass `-DBUILD_FUN_UTILS=ON` to cmake to build them.
-
-##### Vanity key generators
-
-Can be used to generate vanity Tox Ids or DHT bootstrap node public keys.
-
-| Name             | Type       | Dependencies      | Platform       | Description                                                                                                                                                                   |
-| ---------------- | ---------- | ----------------- | -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `cracker`        | Executable | libsodium, OpenMP | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which starts with a specified byte sequence. Multi-threaded.                                     |
-| `cracker_simple` | Executable | libsodium         | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which starts with a specified byte sequence. Single-threaded.                                    |
-| `strkey`         | Executable | libsodium         | Cross-platform | Tries to find a curve25519 key pair, hex representation of the public key of which contains a specified byte sequence at a specified or any position at all. Single-threaded. |
-
-##### Key file generators
-
-Useful for generating Tox profiles from the output of the vanity key generators,
-as well as generating random Tox profiles.
-
-| Name                      | Type       | Dependencies          | Platform       | Description                                                                                                                                                                     |
-| ------------------------- | ---------- | --------------------- | -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| `make-funny-savefile`     | Script     | python                | Cross-platform | Generates a Tox profile file (savedata file) with the provided key pair.                                                                                                        |
-| `create_bootstrap_keys`   | Executable | libsodium             | Cross-platform | Generates a keys file for tox-bootstrapd with either the provided or a random key pair.                                                                                         |
-| `create_minimal_savedata` | Executable | libsodium             | Cross-platform | Generates a minimal Tox profile file (savedata file) with either the provided or a random key pair, printing the generated Tox Id and secret & public key information.          |
-| `create_savedata`         | Executable | libsodium, libtoxcore | Cross-platform | Generates a Tox profile file (savedata file) with either the provided or a random key pair using libtoxcore, printing the generated Tox Id and secret & public key information. |
-| `save-generator`          | Executable | libtoxcore            | Cross-platform | Generates a Tox profile file (savedata file) with a random key pair using libtoxcore, setting the specified user name, going online and adding specified Tox Ids as friends.    |
-
-##### Other
-
-| Name                  | Type       | Dependencies | Platform       | Description                                                                                                                               |
-| --------------------- | ---------- | ------------ | -------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
-| `bootstrap_node_info` | Script     | python3      | Cross-platform | Prints version and Message Of The Day (MOTD) information of the specified DHT bootstrap node, given the node doesn't have those disabled. |
-| `sign`                | Executable | libsodium    | Cross-platform | Signs a file with a ed25519 key.                                                                                                          |
-
-## Building
-
-### Requirements
-
-#### Library dependencies
-
-Library dependencies are listed in the [components](#components) table. The
-dependencies need to be satisfied for the components to be built. Note that if
-you don't have a dependency for some component, e.g. you don't have `libopus`
-installed required for building `toxav` component, building of that component is
-silently disabled.
-
-Be advised that due to the addition of `cmp` as a submodule, you now also need
-to initialize the git submodules required by toxcore. This can be done by
-cloning the repo with the addition of `--recurse-submodules` or by running
-`git submodule update --init` in the root directory of the repo.
-
-#### Compiler requirements
-
-The supported compilers are GCC, Clang and MinGW.
-
-In theory, any compiler that fully supports C99 and accepts GCC flags should
-work.
-
-There is a partial and experimental support of Microsoft Visual C++ compiler. We
-welcome any patches that help improve it.
-
-You should have a C99 compatible compiler in order to build the main components.
-The secondary components might require the compiler to support GNU extensions.
-
-#### Build system requirements
-
-To build the main components you need to have CMake of at least 2.8.6 version
-installed. You also need to have pkg-config installed, the build system uses it
-to find dependency libraries.
-
-There is some experimental accommodation for building natively on Windows, i.e.
-without having to use MSYS/Cygwin and pkg-config, but it uses exact hardcoded
-paths for finding libraries and supports building only of some of toxcore
-components, so your mileage might vary.
-
-### CMake options
-
-There are some options that are available to configure the build.
-
-| Name                    | Description                                                                                   | Expected Value                                                            | Default Value                                     |
-| ----------------------- | --------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------- | ------------------------------------------------- |
-| `AUTOTEST`              | Enable autotests (mainly for CI).                                                             | ON or OFF                                                                 | OFF                                               |
-| `BOOTSTRAP_DAEMON`      | Enable building of tox-bootstrapd, the DHT bootstrap node daemon. For Unix-like systems only. | ON or OFF                                                                 | ON                                                |
-| `BUILD_FUN_UTILS`       | Build additional just for fun utilities.                                                      | ON or OFF                                                                 | OFF                                               |
-| `BUILD_FUZZ_TESTS`      | Build fuzzing harnesses.                                                                      | ON or OFF                                                                 | OFF                                               |
-| `BUILD_MISC_TESTS`      | Build additional tests.                                                                       | ON or OFF                                                                 | OFF                                               |
-| `BUILD_TOXAV`           | Whether to build the toxav library.                                                           | ON or OFF                                                                 | ON                                                |
-| `CMAKE_BUILD_TYPE`      | Specifies the build type on single-configuration generators (e.g. make or ninja).             | Debug, Release, RelWithDebInfo, MinSizeRel                                | Empty string.                                     |
-| `CMAKE_INSTALL_PREFIX`  | Path to where everything should be installed.                                                 | Directory path.                                                           | Platform-dependent. Refer to CMake documentation. |
-| `DHT_BOOTSTRAP`         | Enable building of `DHT_bootstrap`.                                                           | ON or OFF                                                                 | ON                                                |
-| `ENABLE_SHARED`         | Build shared (dynamic) libraries for all modules.                                             | ON or OFF                                                                 | ON                                                |
-| `ENABLE_STATIC`         | Build static libraries for all modules.                                                       | ON or OFF                                                                 | ON                                                |
-| `EXPERIMENTAL_API`      | Install experimental header file with unstable API.                                           | ON or OFF                                                                 | OFF                                               |
-| `FLAT_OUTPUT_STRUCTURE` | Whether to produce output artifacts in {bin,lib}.                                             | ON or OFF                                                                 | OFF                                               |
-| `FULLY_STATIC`          | Build fully static executables.                                                               | ON or OFF                                                                 | OFF                                               |
-| `MIN_LOGGER_LEVEL`      | Logging level to use.                                                                         | TRACE, DEBUG, INFO, WARNING, ERROR or nothing (empty string) for default. | Empty string.                                     |
-| `MSVC_STATIC_SODIUM`    | Whether to link libsodium statically for MSVC.                                                | ON or OFF                                                                 | OFF                                               |
-| `MUST_BUILD_TOXAV`      | Fail the build if toxav cannot be built.                                                      | ON or OFF                                                                 | OFF                                               |
-| `NON_HERMETIC_TESTS`    | Whether to build and run tests that depend on an internet connection.                         | ON or OFF                                                                 | OFF                                               |
-| `PROXY_TEST`            | Enable proxy test (requires `other/proxy/proxy_server.go` to be running).                     | ON or OFF                                                                 | OFF                                               |
-| `STRICT_ABI`            | Enforce strict ABI export in dynamic libraries.                                               | ON or OFF                                                                 | OFF                                               |
-| `TEST_TIMEOUT_SECONDS`  | Limit runtime of each test to the number of seconds specified.                                | Positive number or nothing (empty string).                                | Empty string.                                     |
-| `UNITTEST`              | Enable unit tests (disable if you don't have a working gmock or gtest).                       | ON or OFF                                                                 | ON                                                |
-| `USE_IPV6`              | Use IPv6 in tests.                                                                            | ON or OFF                                                                 | ON                                                |
-
-You can get this list of option using the following commands
-
-```sh
-cmake -B _build -LAH
-```
-
-or
-
-```sh
-grep "option(" CMakeLists.txt cmake/*
-grep "set(.* CACHE" CMakeLists.txt cmake/*
-```
-
-Note that some options might be considered only if other options are enabled.
-
-Example of calling cmake with options
-
-```sh
-cmake \
-  -D ENABLE_STATIC=OFF \
-  -D ENABLE_SHARED=ON \
-  -D CMAKE_INSTALL_PREFIX="${PWD}/prefix" \
-  -D CMAKE_BUILD_TYPE=Release \
-  -D TEST_TIMEOUT_SECONDS=120 \
-  ..
-```
-
-### Building tests
-
-In addition to the integration tests ("autotests") and miscellaneous tests
-enabled by cmake variables described above, there are unit tests which will be
-built if the source distribution of gtest (the Google Unit Test framework) is
-found by cmake in `c-toxcore/third_party`. This can be achieved by running 'git
-clone https://github.com/google/googletest` from that directory.
-
-### Build process
-
-#### Unix-like
-
-Assuming all the [requirements](#requirements) are met, just run
-
-```sh
-mkdir _build
-cd _build
-cmake ..
-make
-make install
-```
-
-or shorter
-
-```sh
-cmake -B _build
-cmake -B _build --target install
-```
-
-#### Windows
-
-##### Building on Windows host
-
-###### Microsoft Visual Studio's Developer Command Prompt
-
-In addition to meeting the [requirements](#requirements), you need a version of
-Visual Studio (the
-[community edition](https://www.visualstudio.com/vs/visual-studio-express/) is
-enough) and a CMake version that's compatible with the Visual Studio version
-you're using.
-
-You must also ensure that the msvc versions of dependencies you're using are
-placed in the correct folders.
-
-For libsodium that is `c-toxcore/third_party/libsodium`, and for pthreads-w32,
-it's `c-toxcore/third_party/pthreads-win32`
-
-Once all of this is done, from the **Developer Command Prompt for VS**, simply
-run
-
-```
-mkdir _build
-cd _build
-cmake ..
-msbuild ALL_BUILD.vcxproj
-```
-
-###### MSYS/Cygwin
-
-Download Cygwin
-([32-bit](https://cygwin.com/setup-x86.exe)/[64-bit](https://cygwin.com/setup-x86_64.exe))
-
-Search and select exactly these packages in Devel category:
-
- mingw64-i686-gcc-core (32-bit) / mingw64-x86_64-gcc-core (64-bit)
- mingw64-i686-gcc-g++ (32-bit) / mingw64-x86_64-gcc-g++ (64-bit)
- make
- cmake
- libtool
- autoconf
- automake
- tree
- curl
- perl
- yasm
- pkg-config
-
-To handle Windows EOL correctly run the following in the Cygwin Terminal:
-
-```sh
-echo '
-export SHELLOPTS
-set -o igncr
-' > ~/.bash_profile
-```
-
-Download toxcore source code and extract it to a folder.
-
-Open Cygwin Terminal in the toxcore folder and run
-`./other/windows_build_script_toxcore.sh` to start the build process.
-
-Toxcore build result files will appear in `/root/prefix/` relatively to Cygwin
-folder (default `C:\cygwin64`).
-
-Dependency versions can be customized in
-`./other/windows_build_script_toxcore.sh` and described in the section below.
-
-##### Cross-compiling from Linux
-
-These cross-compilation instructions were tested on and written for 64-bit
-Ubuntu 16.04. You could generalize them for any Linux system, the only
-requirements are that you have Docker version of >= 1.9.0 and you are running
-64-bit system.
-
-The cross-compilation is fully automated by a parameterized
-[Dockerfile](/other/docker/windows/Dockerfile).
-
-Install Docker
-
-```sh
-apt-get update
-apt-get install docker.io
-```
-
-Get the toxcore source code and navigate to `other/docker/windows`.
-
-Build the container image based on the Dockerfile. The following options are
-available to customize the building of the container image.
-
-| Name                       | Description                                           | Expected Value                      | Default Value |
-| -------------------------- | ----------------------------------------------------- | ----------------------------------- | ------------- |
-| `SUPPORT_ARCH_i686`        | Support building 32-bit toxcore.                      | "true" or "false" (case sensitive). | true          |
-| `SUPPORT_ARCH_x86_64`      | Support building 64-bit toxcore.                      | "true" or "false" (case sensitive). | true          |
-| `SUPPORT_TEST`             | Support running toxcore automated tests.              | "true" or "false" (case sensitive). | false         |
-| `VERSION_OPUS`             | Version of libopus to build toxcore with.             | Numeric version number.             | 1.4           |
-| `VERSION_SODIUM`           | Version of libsodium to build toxcore with.           | Numeric version number.             | 1.0.19        |
-| `VERSION_VPX`              | Version of libvpx to build toxcore with.              | Numeric version number.             | 1.14.0        |
-| `ENABLE_HASH_VERIFICATION` | Verify the hashes of the default dependency versions. | "true" or "false" (case sensitive). | true          |
-
-Example of building a container image with options
-
-```sh
-cd other/docker/windows
-docker build \
-  --build-arg SUPPORT_TEST=true \
-  -t toxcore \
-  .
-```
-
-Run the container to build toxcore. The following options are available to
-customize the running of the container image.
-
-| Name                 | Description                                                                                | Expected Value                      | Default Value                              |
-| -------------------- | ------------------------------------------------------------------------------------------ | ----------------------------------- | ------------------------------------------ |
-| `ALLOW_TEST_FAILURE` | Don't stop if a test suite fails.                                                          | "true" or "false" (case sensitive). | `false`                                    |
-| `ENABLE_ARCH_i686`   | Build 32-bit toxcore. The image should have been built with `SUPPORT_ARCH_i686` enabled.   | "true" or "false" (case sensitive). | `true`                                     |
-| `ENABLE_ARCH_x86_64` | Build 64-bit toxcore. The image should have been built with `SUPPORT_ARCH_x86_64` enabled. | "true" or "false" (case sensitive). | `true`                                     |
-| `ENABLE_TEST`        | Run the test suite. The image should have been built with `SUPPORT_TEST` enabled.          | "true" or "false" (case sensitive). | `false`                                    |
-| `EXTRA_CMAKE_FLAGS`  | Extra arguments to pass to the CMake command when building toxcore.                        | CMake options.                      | `-DTEST_TIMEOUT_SECONDS=90 -DUSE_IPV6=OFF` |
-
-Example of running the container with options
-
-```sh
-docker run \
-  -e ENABLE_TEST=true \
-  -e ALLOW_TEST_FAILURE=true \
-  -v /path/to/toxcore/sourcecode:/toxcore \
-  -v /path/to/where/output/build/result:/prefix \
-  -t \
-  --rm \
-  toxcore
-```
-
-After the build succeeds, you should see the built toxcore libraries in
-`/path/to/where/output/build/result`.
-
-The file structure should look similar to the following
-
-```
-result
-├── [4.0K]  i686
-│   ├── [ 36K]  bin
-│   │   ├── [636K]  DHT_bootstrap.exe
-│   │   ├── [572K]  cracker.exe
-│   │   ├── [359K]  cracker_simple.exe
-│   │   ├── [378K]  create_bootstrap_keys.exe
-│   │   ├── [378K]  create_minimal_savedata.exe
-│   │   ├── [958K]  create_savedata.exe
-│   │   ├── [ 18K]  libtoxcore.def
-│   │   ├── [2.6M]  libtoxcore.dll
-│   │   ├── [ 65K]  libtoxcore.exp
-│   │   ├── [428K]  libtoxcore.lib
-│   │   ├── [989K]  save-generator.exe
-│   │   ├── [381K]  sign.exe
-│   │   └── [408K]  strkey.exe
-│   ├── [4.0K]  include
-│   │   └── [4.0K]  tox
-│   │       ├── [177K]  tox.h
-│   │       ├── [ 10K]  tox_dispatch.h
-│   │       ├── [ 26K]  tox_events.h
-│   │       ├── [6.4K]  tox_private.h
-│   │       ├── [ 26K]  toxav.h
-│   │       └── [ 12K]  toxencryptsave.h
-│   └── [4.0K]  lib
-│       ├── [577K]  libopus.a
-│       ├── [660K]  libsodium.a
-│       ├── [ 10K]  libssp.a
-│       ├── [1016K]  libtoxcore.a
-│       ├── [456K]  libtoxcore.dll.a
-│       ├── [2.7M]  libvpx.a
-│       ├── [ 72K]  libwinpthread.a
-│       └── [4.0K]  pkgconfig
-│           ├── [ 250]  libsodium.pc
-│           ├── [ 357]  opus.pc
-│           ├── [ 247]  toxcore.pc
-│           └── [ 309]  vpx.pc
-└── [4.0K]  x86_64
-    ├── [ 36K]  bin
-    │   ├── [504K]  DHT_bootstrap.exe
-    │   ├── [474K]  cracker.exe
-    │   ├── [277K]  cracker_simple.exe
-    │   ├── [287K]  create_bootstrap_keys.exe
-    │   ├── [288K]  create_minimal_savedata.exe
-    │   ├── [769K]  create_savedata.exe
-    │   ├── [ 18K]  libtoxcore.def
-    │   ├── [2.4M]  libtoxcore.dll
-    │   ├── [ 64K]  libtoxcore.exp
-    │   ├── [420K]  libtoxcore.lib
-    │   ├── [800K]  save-generator.exe
-    │   ├── [289K]  sign.exe
-    │   └── [317K]  strkey.exe
-    ├── [4.0K]  include
-    │   └── [4.0K]  tox
-    │       ├── [177K]  tox.h
-    │       ├── [ 10K]  tox_dispatch.h
-    │       ├── [ 26K]  tox_events.h
-    │       ├── [6.4K]  tox_private.h
-    │       ├── [ 26K]  toxav.h
-    │       └── [ 12K]  toxencryptsave.h
-    └── [4.0K]  lib
-        ├── [697K]  libopus.a
-        ├── [575K]  libsodium.a
-        ├── [ 11K]  libssp.a
-        ├── [905K]  libtoxcore.a
-        ├── [449K]  libtoxcore.dll.a
-        ├── [2.9M]  libvpx.a
-        ├── [ 68K]  libwinpthread.a
-        └── [4.0K]  pkgconfig
-            ├── [ 252]  libsodium.pc
-            ├── [ 359]  opus.pc
-            ├── [ 249]  toxcore.pc
-            └── [ 311]  vpx.pc
-
-12 directories, 60 files
-```
-
- `libtoxcore.dll` is the shared library. It is fully self-contained, with no
-  additional dependencies aside from the Windows OS dlls, and can be used in
-  MSVC, MinGW, Clang, etc. projects. Despite its name, it provides toxcore,
-  toxav, toxencryptsave -- all of Tox.
- `libtoxcore.a` is the static library. In order to use it, it needs to be
-  linked against the other provided .a libraries (but not the .dll.a!) and
-  additionally -liphlpapi and -lws2_32 Windows dlls. It similarly provides all
-  of Tox APIs.
- `libtoxcore.dll.a` is the MinGW import library for `libtoxcore.dll`.
- `libtoxcore.lib` is the MSVC import library for `libtoxcore.dll`.
- `libtoxcore.exp` and `libtoxcore.def` are the exported by `libtoxcore`
-  symbols.
- `*.exe` are statically compiled executables -- `DHT_bootstrap` and
-  [the fun utils](#secondary).
-
-## Pre-built binaries
-
-### Linux
-
-Toxcore is packaged by at least by the following distributions: ALT Linux,
-[Arch Linux](https://www.archlinux.org/packages/?q=toxcore),
-[Fedora](https://apps.fedoraproject.org/packages/toxcore), Mageia, openSUSE,
-PCLinuxOS, ROSA and Slackware,
-[according to the information from pkgs.org](https://pkgs.org/download/toxcore).
-Note that this list might be incomplete and some other distributions might
-package it too.
--- a/README.md
+++ b/README.md
@ -1,205 +1,4 @@
-# ![Project Tox](https://raw.github.com/TokTok/c-toxcore/master/other/tox.png "Project Tox")
+# Tomato

-**Current Coverage:**
-[![coverage](https://codecov.io/gh/TokTok/c-toxcore/branch/master/graph/badge.svg?token=BRfCKo02De)](https://codecov.io/gh/TokTok/c-toxcore)
+![tomato](res/icon/tomato_v1_256.png)

-[**Website**](https://tox.chat) **|** [**Wiki**](https://wiki.tox.chat/) **|**
-[**Blog**](https://blog.tox.chat/) **|**
-[**FAQ**](https://wiki.tox.chat/doku.php?id=users:faq) **|**
-[**Binaries/Downloads**](https://tox.chat/download.html) **|**
-[**Clients**](https://wiki.tox.chat/doku.php?id=clients) **|**
-[**Compiling**](/INSTALL.md)
-
-## What is Tox
-
-Tox is a peer to peer (serverless) instant messenger aimed at making security
-and privacy easy to obtain for regular users. It uses
-[libsodium](https://doc.libsodium.org/) (based on
-[NaCl](https://nacl.cr.yp.to/)) for its encryption and authentication.
-
-## IMPORTANT!
-
-### ![Danger: Experimental](other/tox-warning.png)
-
-This is an **experimental** cryptographic network library. It has not been
-formally audited by an independent third party that specializes in cryptography
-or cryptanalysis. **Use this library at your own risk.**
-
-The underlying crypto library [libsodium](https://doc.libsodium.org/) provides
-reliable encryption, but the security model has not yet been fully specified.
-See [issue 210](https://github.com/TokTok/c-toxcore/issues/210) for a discussion
-on developing a threat model. See other issues for known weaknesses (e.g.
-[issue 426](https://github.com/TokTok/c-toxcore/issues/426) describes what can
-happen if your secret key is stolen).
-
-## Toxcore Development Roadmap
-
-The roadmap and changelog are generated from GitHub issues. You may view them on
-the website, where they are updated at least once every 24 hours:
-
- Changelog: https://toktok.ltd/changelog/c-toxcore
- Roadmap: https://toktok.ltd/roadmap/c-toxcore
-
-## Installing toxcore
-
-Detailed installation instructions can be found in [INSTALL.md](INSTALL.md).
-
-Be advised that due to the addition of `cmp` as a submodule, you now also need
-to initialize the git submodules required by toxcore. This can be done by
-cloning the repo with the following command:
-`git clone --recurse-submodules https://github.com/Toktok/c-toxcore` or by
-running `git submodule update --init` in the root directory of the repo.
-
-In a nutshell, if you have [libsodium](https://github.com/jedisct1/libsodium)
-installed, run:
-
-```sh
-mkdir _build && cd _build
-cmake ..
-make
-sudo make install
-```
-
-If you have [libvpx](https://github.com/webmproject/libvpx) and
-[opus](https://github.com/xiph/opus) installed, the above will also build the
-A/V library for multimedia chats.
-
-## Using toxcore
-
-The simplest "hello world" example could be an echo bot. Here we will walk
-through the implementation of a simple bot.
-
-### Creating the tox instance
-
-All toxcore API functions work with error parameters. They are enums with one
-`OK` value and several error codes that describe the different situations in
-which the function might fail.
-
-```c
-TOX_ERR_NEW err_new;
-Tox *tox = tox_new(NULL, &err_new);
-if (err_new != TOX_ERR_NEW_OK) {
-  fprintf(stderr, "tox_new failed with error code %d\n", err_new);
-  exit(1);
-}
-```
-
-Here, we simply exit the program, but in a real client you will probably want to
-do some error handling and proper error reporting to the user. The `NULL`
-argument given to the first parameter of `tox_new` is the `Tox_Options`. It
-contains various write-once network settings and allows you to load a previously
-serialised instance. See [toxcore/tox.h](tox.h) for details.
-
-### Setting up callbacks
-
-Toxcore works with callbacks that you can register to listen for certain events.
-Examples of such events are "friend request received" or "friend sent a
-message". Search the API for `tox_callback_*` to find all of them.
-
-Here, we will set up callbacks for receiving friend requests and receiving
-messages. We will always accept any friend request (because we're a bot), and
-when we receive a message, we send it back to the sender.
-
-```c
-tox_callback_friend_request(tox, handle_friend_request);
-tox_callback_friend_message(tox, handle_friend_message);
-```
-
-These two function calls set up the callbacks. Now we also need to implement
-these "handle" functions.
-
-### Handle friend requests
-
-```c
-static void handle_friend_request(
-  Tox *tox, const uint8_t *public_key, const uint8_t *message, size_t length,
-  void *user_data) {
-  // Accept the friend request:
-  TOX_ERR_FRIEND_ADD err_friend_add;
-  tox_friend_add_norequest(tox, public_key, &err_friend_add);
-  if (err_friend_add != TOX_ERR_FRIEND_ADD_OK) {
-    fprintf(stderr, "unable to add friend: %d\n", err_friend_add);
-  }
-}
-```
-
-The `tox_friend_add_norequest` function adds the friend without sending them a
-friend request. Since we already got a friend request, this is the right thing
-to do. If you wanted to send a friend request yourself, you would use
-`tox_friend_add`, which has an extra parameter for the message.
-
-### Handle messages
-
-Now, when the friend sends us a message, we want to respond to them by sending
-them the same message back. This will be our "echo".
-
-```c
-static void handle_friend_message(
-  Tox *tox, uint32_t friend_number, TOX_MESSAGE_TYPE type,
-  const uint8_t *message, size_t length,
-  void *user_data) {
-  TOX_ERR_FRIEND_SEND_MESSAGE err_send;
-  tox_friend_send_message(tox, friend_number, type, message, length,
-    &err_send);
-  if (err_send != TOX_ERR_FRIEND_SEND_MESSAGE_OK) {
-    fprintf(stderr, "unable to send message back to friend %d: %d\n",
-      friend_number, err_send);
-  }
-}
-```
-
-That's it for the setup. Now we want to actually run the bot.
-
-### Main event loop
-
-Toxcore works with a main event loop function `tox_iterate` that you need to
-call at a certain frequency dictated by `tox_iteration_interval`. This is a
-polling function that receives new network messages and processes them.
-
-```c
-while (true) {
-  usleep(1000 * tox_iteration_interval(tox));
-  tox_iterate(tox, NULL);
-}
-```
-
-That's it! Now you have a working echo bot. The only problem is that since Tox
-works with public keys, and you can't really guess your bot's public key, you
-can't add it as a friend in your client. For this, we need to call another API
-function: `tox_self_get_address(tox, address)`. This will fill the 38 byte
-friend address into the `address` buffer. You can then display that binary
-string as hex and input it into your client. Writing a `bin2hex` function is
-left as exercise for the reader.
-
-We glossed over a lot of details, such as the user data which we passed to
-`tox_iterate` (passing `NULL`), bootstrapping into an actual network (this bot
-will work in the LAN, but not on an internet server) and the fact that we now
-have no clean way of stopping the bot (`while (true)`). If you want to write a
-real bot, you will probably want to read up on all the API functions. Consult
-the API documentation in [toxcore/tox.h](toxcore/tox.h) for more information.
-
-### Other resources
-
- [Another echo bot](https://wiki.tox.chat/developers/client_examples/echo_bot)
- [minitox](https://github.com/hqwrong/minitox) (A minimal tox client)
-
-## SAST Tools
-
-This project uses various tools supporting Static Application Security Testing:
-
- [clang-tidy](https://clang.llvm.org/extra/clang-tidy/): A clang-based C++
-  "linter" tool.
- [Coverity](https://scan.coverity.com/): A cloud-based static analyzer service
-  for Java, C/C++, C#, JavaScript, Ruby, or Python that is free for open source
-  projects.
- [cppcheck](https://cppcheck.sourceforge.io/): A static analyzer for C/C++
-  code.
- [cpplint](https://github.com/cpplint/cpplint): Static code checker for C++
- [goblint](https://goblint.in.tum.de/): A static analyzer for multi-threaded C
-  programs, specializing in finding concurrency bugs.
- [infer](https://github.com/facebook/infer): A static analyzer for Java, C,
-  C++, and Objective-C.
- [PVS-Studio](https://pvs-studio.com/en/pvs-studio/?utm_source=website&utm_medium=github&utm_campaign=open_source):
-  A static analyzer for C, C++, C#, and Java code.
- [tokstyle](https://github.com/TokTok/hs-tokstyle): A style checker for TokTok
-  C projects.
--- a/auto_tests/CMakeLists.txt
+++ b/auto_tests/CMakeLists.txt
@ -1,119 +0,0 @@
-set(TEST_TIMEOUT_SECONDS "" CACHE STRING "Limit runtime of each test to the number of seconds specified")
-
-add_library(auto_test_support
-  auto_test_support.c
-  auto_test_support.h)
-target_link_libraries(auto_test_support PRIVATE misc_tools)
-if(TARGET toxcore_static)
-  target_link_libraries(auto_test_support PRIVATE toxcore_static)
-else()
-  target_link_libraries(auto_test_support PRIVATE toxcore_shared)
-endif()
-if(TARGET PThreads4W::PThreads4W)
-  target_link_libraries(auto_test_support PRIVATE PThreads4W::PThreads4W)
-elseif(TARGET Threads::Threads)
-  target_link_libraries(auto_test_support PRIVATE Threads::Threads)
-endif()
-
-function(auto_test target)
-  add_executable(auto_${target}_test ${target}_test.c)
-  target_link_libraries(auto_${target}_test PRIVATE misc_tools auto_test_support)
-  if(TARGET toxcore_static)
-    target_link_libraries(auto_${target}_test PRIVATE toxcore_static)
-  else()
-    target_link_libraries(auto_${target}_test PRIVATE toxcore_shared)
-  endif()
-  if(TARGET PThreads4W::PThreads4W)
-    target_link_libraries(auto_${target}_test PRIVATE PThreads4W::PThreads4W)
-  elseif(TARGET Threads::Threads)
-    target_link_libraries(auto_${target}_test PRIVATE Threads::Threads)
-  endif()
-  add_test(NAME ${target} COMMAND ${CROSSCOMPILING_EMULATOR} auto_${target}_test)
-  set_tests_properties(${target} PROPERTIES TIMEOUT "${TEST_TIMEOUT_SECONDS}")
-  # add the source dir as environment variable, so the testdata can be found
-  set_tests_properties(${target} PROPERTIES ENVIRONMENT "LLVM_PROFILE_FILE=${target}.profraw;srcdir=${CMAKE_CURRENT_SOURCE_DIR}")
-endfunction()
-
-auto_test(TCP)
-auto_test(announce)
-auto_test(conference)
-auto_test(conference_double_invite)
-auto_test(conference_invite_merge)
-auto_test(conference_peer_nick)
-auto_test(conference_simple)
-auto_test(conference_two)
-auto_test(crypto)
-#auto_test(dht)  # Doesn't work with UNITY_BUILD.
-auto_test(dht_getnodes_api)
-auto_test(encryptsave)
-auto_test(file_saving)
-auto_test(file_streaming)
-auto_test(file_transfer)
-auto_test(forwarding)
-auto_test(friend_connection)
-auto_test(friend_request)
-auto_test(friend_request_spam)
-auto_test(group_general)
-auto_test(group_invite)
-auto_test(group_message)
-auto_test(group_moderation)
-auto_test(group_save)
-auto_test(group_state)
-auto_test(group_sync)
-auto_test(group_tcp)
-auto_test(group_topic)
-auto_test(invalid_tcp_proxy)
-auto_test(invalid_udp_proxy)
-auto_test(lan_discovery)
-auto_test(lossless_packet)
-auto_test(lossy_packet)
-auto_test(network)
-auto_test(onion)
-auto_test(overflow_recvq)
-auto_test(overflow_sendq)
-auto_test(reconnect)
-auto_test(save_friend)
-auto_test(save_load)
-auto_test(send_message)
-auto_test(set_name)
-auto_test(set_status_message)
-auto_test(tox_dispatch)
-auto_test(tox_events)
-auto_test(tox_many)
-auto_test(tox_many_tcp)
-auto_test(tox_strncasecmp)
-auto_test(typing)
-auto_test(version)
-auto_test(save_compatibility)
-
-target_include_directories(auto_encryptsave_test SYSTEM PRIVATE ${LIBSODIUM_INCLUDE_DIRS})
-
-if(NON_HERMETIC_TESTS)
-  auto_test(bootstrap)
-  auto_test(tcp_relay)
-endif()
-
-if(BUILD_TOXAV)
-  auto_test(conference_av)
-  auto_test(toxav_basic)
-  auto_test(toxav_many)
-
-  if(MSVC)
-    target_link_libraries(auto_toxav_basic_test PRIVATE PkgConfig::VPX)
-    target_link_libraries(auto_toxav_many_test PRIVATE PkgConfig::VPX)
-  else()
-    target_link_libraries(auto_toxav_basic_test PRIVATE ${VPX_LIBRARIES})
-    target_link_directories(auto_toxav_basic_test PRIVATE ${VPX_LIBRARY_DIRS})
-    target_include_directories(auto_toxav_basic_test SYSTEM PRIVATE ${VPX_INCLUDE_DIRS})
-    target_compile_options(auto_toxav_basic_test PRIVATE ${VPX_CFLAGS_OTHER})
-
-    target_link_libraries(auto_toxav_many_test PRIVATE ${VPX_LIBRARIES})
-    target_link_directories(auto_toxav_many_test PRIVATE ${VPX_LIBRARY_DIRS})
-    target_include_directories(auto_toxav_many_test SYSTEM PRIVATE ${VPX_INCLUDE_DIRS})
-    target_compile_options(auto_toxav_many_test PRIVATE ${VPX_CFLAGS_OTHER})
-  endif()
-endif()
-
-if(PROXY_TEST)
-  auto_test(proxy)
-endif()
--- a/auto_tests/conference_simple_test.c
+++ b/auto_tests/conference_simple_test.c
@ -1,268 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "../testing/misc_tools.h"
-#include "../toxcore/tox.h"
-#include "../toxcore/tox_dispatch.h"
-#include "../toxcore/tox_events.h"
-#include "auto_test_support.h"
-#include "check_compat.h"
-
-typedef struct State {
-    uint32_t id;
-    Tox *tox;
-    bool self_online;
-    bool friend_online;
-    bool invited_next;
-
-    bool joined;
-    uint32_t conference;
-
-    bool received;
-
-    uint32_t peers;
-} State;
-
-static void handle_self_connection_status(const Tox_Event_Self_Connection_Status *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const Tox_Connection connection_status = tox_event_self_connection_status_get_connection_status(event);
-    fprintf(stderr, "self_connection_status(#%u, %d, _)\n", state->id, connection_status);
-    state->self_online = connection_status != TOX_CONNECTION_NONE;
-}
-
-static void handle_friend_connection_status(const Tox_Event_Friend_Connection_Status *event,
-        void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t friend_number = tox_event_friend_connection_status_get_friend_number(event);
-    const Tox_Connection connection_status = tox_event_friend_connection_status_get_connection_status(event);
-    fprintf(stderr, "handle_friend_connection_status(#%u, %u, %d, _)\n", state->id, friend_number, connection_status);
-    state->friend_online = connection_status != TOX_CONNECTION_NONE;
-}
-
-static void handle_conference_invite(const Tox_Event_Conference_Invite *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t friend_number = tox_event_conference_invite_get_friend_number(event);
-    const Tox_Conference_Type type = tox_event_conference_invite_get_type(event);
-    const uint8_t *cookie = tox_event_conference_invite_get_cookie(event);
-    const size_t length = tox_event_conference_invite_get_cookie_length(event);
-    fprintf(stderr, "handle_conference_invite(#%u, %u, %d, uint8_t[%u], _)\n",
-            state->id, friend_number, type, (unsigned)length);
-    fprintf(stderr, "tox%u joining conference\n", state->id);
-
-    {
-        Tox_Err_Conference_Join err;
-        state->conference = tox_conference_join(state->tox, friend_number, cookie, length, &err);
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_JOIN_OK, "failed to join a conference: err = %d", err);
-        fprintf(stderr, "tox%u Joined conference %u\n", state->id, state->conference);
-        state->joined = true;
-    }
-}
-
-static void handle_conference_message(const Tox_Event_Conference_Message *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t conference_number = tox_event_conference_message_get_conference_number(event);
-    const uint32_t peer_number = tox_event_conference_message_get_peer_number(event);
-    const Tox_Message_Type type = tox_event_conference_message_get_type(event);
-    const uint8_t *message = tox_event_conference_message_get_message(event);
-    const size_t length = tox_event_conference_message_get_message_length(event);
-
-    fprintf(stderr, "handle_conference_message(#%u, %u, %u, %d, uint8_t[%u], _)\n",
-            state->id, conference_number, peer_number, type, (unsigned)length);
-
-    fprintf(stderr, "tox%u got message: %s\n", state->id, (const char *)message);
-    state->received = true;
-}
-
-static void handle_conference_peer_list_changed(const Tox_Event_Conference_Peer_List_Changed *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    const uint32_t conference_number = tox_event_conference_peer_list_changed_get_conference_number(event);
-    fprintf(stderr, "handle_conference_peer_list_changed(#%u, %u, _)\n",
-            state->id, conference_number);
-
-    Tox_Err_Conference_Peer_Query err;
-    uint32_t count = tox_conference_peer_count(state->tox, conference_number, &err);
-
-    if (err != TOX_ERR_CONFERENCE_PEER_QUERY_OK) {
-        fprintf(stderr, "ERROR: %d\n", err);
-        exit(EXIT_FAILURE);
-    }
-
-    fprintf(stderr, "tox%u has %u peers online\n", state->id, count);
-    state->peers = count;
-}
-
-static void handle_conference_connected(const Tox_Event_Conference_Connected *event, void *user_data)
-{
-    State *state = (State *)user_data;
-
-    // We're tox2, so now we invite tox3.
-    if (state->id == 2 && !state->invited_next) {
-        Tox_Err_Conference_Invite err;
-        tox_conference_invite(state->tox, 1, state->conference, &err);
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_INVITE_OK, "tox2 failed to invite tox3: err = %d", err);
-
-        state->invited_next = true;
-        fprintf(stderr, "tox2 invited tox3\n");
-    }
-}
-
-static void iterate_one(
-    Tox *tox, State *state, const Tox_Dispatch *dispatch)
-{
-    Tox_Err_Events_Iterate err;
-    Tox_Events *events = tox_events_iterate(tox, true, &err);
-    ck_assert(err == TOX_ERR_EVENTS_ITERATE_OK);
-    tox_dispatch_invoke(dispatch, events, state);
-    tox_events_free(events);
-}
-
-static void iterate3_wait(
-    State *state1, State *state2, State *state3,
-    const Tox_Dispatch *dispatch, int interval)
-{
-    iterate_one(state1->tox, state1, dispatch);
-    iterate_one(state2->tox, state2, dispatch);
-    iterate_one(state3->tox, state3, dispatch);
-
-    c_sleep(interval);
-}
-
-int main(void)
-{
-    setvbuf(stdout, nullptr, _IONBF, 0);
-
-    State state1 = {1};
-    State state2 = {2};
-    State state3 = {3};
-
-    // Create toxes.
-    state1.tox = tox_new_log(nullptr, nullptr, &state1.id);
-    state2.tox = tox_new_log(nullptr, nullptr, &state2.id);
-    state3.tox = tox_new_log(nullptr, nullptr, &state3.id);
-
-    tox_events_init(state1.tox);
-    tox_events_init(state2.tox);
-    tox_events_init(state3.tox);
-
-    // tox1 <-> tox2, tox2 <-> tox3
-    uint8_t key[TOX_PUBLIC_KEY_SIZE];
-    tox_self_get_public_key(state2.tox, key);
-    tox_friend_add_norequest(state1.tox, key, nullptr);  // tox1 -> tox2
-    tox_self_get_public_key(state1.tox, key);
-    tox_friend_add_norequest(state2.tox, key, nullptr);  // tox2 -> tox1
-    tox_self_get_public_key(state3.tox, key);
-    tox_friend_add_norequest(state2.tox, key, nullptr);  // tox2 -> tox3
-    tox_self_get_public_key(state2.tox, key);
-    tox_friend_add_norequest(state3.tox, key, nullptr);  // tox3 -> tox2
-
-    printf("bootstrapping tox2 and tox3 off tox1\n");
-    uint8_t dht_key[TOX_PUBLIC_KEY_SIZE];
-    tox_self_get_dht_id(state1.tox, dht_key);
-    const uint16_t dht_port = tox_self_get_udp_port(state1.tox, nullptr);
-
-    tox_bootstrap(state2.tox, "localhost", dht_port, dht_key, nullptr);
-    tox_bootstrap(state3.tox, "localhost", dht_port, dht_key, nullptr);
-
-    Tox_Dispatch *dispatch = tox_dispatch_new(nullptr);
-    ck_assert(dispatch != nullptr);
-
-    // Connection callbacks.
-    tox_events_callback_self_connection_status(dispatch, handle_self_connection_status);
-    tox_events_callback_friend_connection_status(dispatch, handle_friend_connection_status);
-
-    // Conference callbacks.
-    tox_events_callback_conference_invite(dispatch, handle_conference_invite);
-    tox_events_callback_conference_connected(dispatch, handle_conference_connected);
-    tox_events_callback_conference_message(dispatch, handle_conference_message);
-    tox_events_callback_conference_peer_list_changed(dispatch, handle_conference_peer_list_changed);
-
-    // Wait for self connection.
-    fprintf(stderr, "Waiting for toxes to come online\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (!state1.self_online || !state2.self_online || !state3.self_online);
-
-    fprintf(stderr, "Toxes are online\n");
-
-    // Wait for friend connection.
-    fprintf(stderr, "Waiting for friends to connect\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (!state1.friend_online || !state2.friend_online || !state3.friend_online);
-
-    fprintf(stderr, "Friends are connected\n");
-
-    {
-        // Create new conference, tox1 is the founder.
-        Tox_Err_Conference_New err;
-        state1.conference = tox_conference_new(state1.tox, &err);
-        state1.joined = true;
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_NEW_OK, "failed to create a conference: err = %d", err);
-        fprintf(stderr, "Created conference: id = %u\n", state1.conference);
-    }
-
-    {
-        // Invite friend.
-        Tox_Err_Conference_Invite err;
-        tox_conference_invite(state1.tox, 0, state1.conference, &err);
-        ck_assert_msg(err == TOX_ERR_CONFERENCE_INVITE_OK, "failed to invite a friend: err = %d", err);
-        state1.invited_next = true;
-        fprintf(stderr, "tox1 invited tox2\n");
-    }
-
-    fprintf(stderr, "Waiting for invitation to arrive\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (!state1.joined || !state2.joined || !state3.joined);
-
-    fprintf(stderr, "Invitations accepted\n");
-
-    fprintf(stderr, "Waiting for peers to come online\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-    } while (state1.peers == 0 || state2.peers == 0 || state3.peers == 0);
-
-    fprintf(stderr, "All peers are online\n");
-
-    {
-        fprintf(stderr, "tox1 sends a message to the group: \"hello!\"\n");
-        Tox_Err_Conference_Send_Message err;
-        tox_conference_send_message(state1.tox, state1.conference, TOX_MESSAGE_TYPE_NORMAL,
-                                    (const uint8_t *)"hello!", 7, &err);
-
-        if (err != TOX_ERR_CONFERENCE_SEND_MESSAGE_OK) {
-            fprintf(stderr, "ERROR: %d\n", err);
-            exit(EXIT_FAILURE);
-        }
-    }
-
-    fprintf(stderr, "Waiting for messages to arrive\n");
-
-    do {
-        iterate3_wait(&state1, &state2, &state3, dispatch, 100);
-        c_sleep(100);
-    } while (!state2.received || !state3.received);
-
-    fprintf(stderr, "Messages received. Test complete.\n");
-
-    tox_dispatch_free(dispatch);
-    tox_kill(state3.tox);
-    tox_kill(state2.tox);
-    tox_kill(state1.tox);
-
-    return 0;
-}
--- a/auto_tests/data/save.tox.little
+++ b/auto_tests/data/save.tox.little
--- a/auto_tests/file_streaming_test.c
+++ b/auto_tests/file_streaming_test.c
@ -1,272 +0,0 @@
-/* File transfer test: streaming version (no known size).
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#include "../testing/misc_tools.h"
-#include "../toxcore/ccompat.h"
-#include "../toxcore/tox.h"
-#include "../toxcore/util.h"
-#include "auto_test_support.h"
-#include "check_compat.h"
-
-#ifndef USE_IPV6
-#define USE_IPV6 1
-#endif
-
-#ifdef TOX_LOCALHOST
-#undef TOX_LOCALHOST
-#endif
-#if USE_IPV6
-#define TOX_LOCALHOST "::1"
-#else
-#define TOX_LOCALHOST "127.0.0.1"
-#endif
-
-static void accept_friend_request(Tox *m, const uint8_t *public_key, const uint8_t *data, size_t length, void *userdata)
-{
-    if (length == 7 && memcmp("Gentoo", data, 7) == 0) {
-        tox_friend_add_norequest(m, public_key, nullptr);
-    }
-}
-
-static uint64_t size_recv;
-static uint64_t sending_pos;
-
-static uint8_t file_cmp_id[TOX_FILE_ID_LENGTH];
-static uint32_t file_accepted;
-static uint64_t file_size;
-static void tox_file_receive(Tox *tox, uint32_t friend_number, uint32_t file_number, uint32_t kind, uint64_t filesize,
-                             const uint8_t *filename, size_t filename_length, void *userdata)
-{
-    ck_assert_msg(kind == TOX_FILE_KIND_DATA, "bad kind");
-
-    ck_assert_msg(filename_length == sizeof("Gentoo.exe")
-                  && memcmp(filename, "Gentoo.exe", sizeof("Gentoo.exe")) == 0, "bad filename");
-
-    uint8_t file_id[TOX_FILE_ID_LENGTH];
-
-    ck_assert_msg(tox_file_get_file_id(tox, friend_number, file_number, file_id, nullptr), "tox_file_get_file_id error");
-
-    ck_assert_msg(memcmp(file_id, file_cmp_id, TOX_FILE_ID_LENGTH) == 0, "bad file_id");
-
-    const uint8_t empty[TOX_FILE_ID_LENGTH] = {0};
-
-    ck_assert_msg(memcmp(empty, file_cmp_id, TOX_FILE_ID_LENGTH) != 0, "empty file_id");
-
-    file_size = filesize;
-
-    if (filesize) {
-        sending_pos = size_recv = 1337;
-
-        Tox_Err_File_Seek err_s;
-
-        ck_assert_msg(tox_file_seek(tox, friend_number, file_number, 1337, &err_s), "tox_file_seek error");
-
-        ck_assert_msg(err_s == TOX_ERR_FILE_SEEK_OK, "tox_file_seek wrong error");
-
-    } else {
-        sending_pos = size_recv = 0;
-    }
-
-    Tox_Err_File_Control error;
-
-    ck_assert_msg(tox_file_control(tox, friend_number, file_number, TOX_FILE_CONTROL_RESUME, &error),
-                  "tox_file_control failed. %i", error);
-    ++file_accepted;
-
-    Tox_Err_File_Seek err_s;
-
-    ck_assert_msg(!tox_file_seek(tox, friend_number, file_number, 1234, &err_s), "tox_file_seek no error");
-
-    ck_assert_msg(err_s == TOX_ERR_FILE_SEEK_DENIED, "tox_file_seek wrong error");
-}
-
-static uint32_t sendf_ok;
-static void file_print_control(Tox *tox, uint32_t friend_number, uint32_t file_number, Tox_File_Control control,
-                               void *userdata)
-{
-    /* First send file num is 0.*/
-    if (file_number == 0 && control == TOX_FILE_CONTROL_RESUME) {
-        sendf_ok = 1;
-    }
-}
-
-static uint64_t max_sending;
-static bool m_send_reached;
-static uint8_t sending_num;
-static bool file_sending_done;
-static void tox_file_chunk_request(Tox *tox, uint32_t friend_number, uint32_t file_number, uint64_t position,
-                                   size_t length, void *user_data)
-{
-    ck_assert_msg(sendf_ok, "didn't get resume control");
-
-    ck_assert_msg(sending_pos == position, "bad position %lu", (unsigned long)position);
-
-    if (length == 0) {
-        ck_assert_msg(!file_sending_done, "file sending already done");
-
-        file_sending_done = 1;
-        return;
-    }
-
-    if (position + length > max_sending) {
-        ck_assert_msg(!m_send_reached, "requested done file transfer");
-
-        length = max_sending - position;
-        m_send_reached = 1;
-    }
-
-    VLA(uint8_t, f_data, length);
-    memset(f_data, sending_num, length);
-
-    Tox_Err_File_Send_Chunk error;
-    tox_file_send_chunk(tox, friend_number, file_number, position, f_data, length, &error);
-
-    ck_assert_msg(error == TOX_ERR_FILE_SEND_CHUNK_OK,
-                  "could not send chunk, error num=%d pos=%d len=%d", (int)error, (int)position, (int)length);
-
-    ++sending_num;
-    sending_pos += length;
-}
-
-static uint8_t num;
-static bool file_recv;
-static void write_file(Tox *tox, uint32_t friendnumber, uint32_t filenumber, uint64_t position, const uint8_t *data,
-                       size_t length, void *user_data)
-{
-    ck_assert_msg(size_recv == position, "bad position");
-
-    if (length == 0) {
-        file_recv = 1;
-        return;
-    }
-
-    VLA(uint8_t, f_data, length);
-    memset(f_data, num, length);
-    ++num;
-
-    ck_assert_msg(memcmp(f_data, data, length) == 0, "FILE_CORRUPTED");
-
-    size_recv += length;
-}
-
-static void file_transfer_test(void)
-{
-    printf("Starting test: few_clients\n");
-    uint32_t index[] = { 1, 2, 3 };
-    long long unsigned int cur_time = time(nullptr);
-    Tox_Err_New t_n_error;
-    Tox *tox1 = tox_new_log(nullptr, &t_n_error, &index[0]);
-    ck_assert_msg(t_n_error == TOX_ERR_NEW_OK, "wrong error");
-    Tox *tox2 = tox_new_log(nullptr, &t_n_error, &index[1]);
-    ck_assert_msg(t_n_error == TOX_ERR_NEW_OK, "wrong error");
-    Tox *tox3 = tox_new_log(nullptr, &t_n_error, &index[2]);
-    ck_assert_msg(t_n_error == TOX_ERR_NEW_OK, "wrong error");
-
-    ck_assert_msg(tox1 && tox2 && tox3, "Failed to create 3 tox instances");
-
-    tox_callback_friend_request(tox2, accept_friend_request);
-    uint8_t address[TOX_ADDRESS_SIZE];
-    tox_self_get_address(tox2, address);
-    uint32_t test = tox_friend_add(tox3, address, (const uint8_t *)"Gentoo", 7, nullptr);
-    ck_assert_msg(test == 0, "Failed to add friend error code: %u", test);
-
-    uint8_t dht_key[TOX_PUBLIC_KEY_SIZE];
-    tox_self_get_dht_id(tox1, dht_key);
-    uint16_t dht_port = tox_self_get_udp_port(tox1, nullptr);
-
-    tox_bootstrap(tox2, TOX_LOCALHOST, dht_port, dht_key, nullptr);
-    tox_bootstrap(tox3, TOX_LOCALHOST, dht_port, dht_key, nullptr);
-
-    printf("Waiting for toxes to come online\n");
-
-    do {
-        tox_iterate(tox1, nullptr);
-        tox_iterate(tox2, nullptr);
-        tox_iterate(tox3, nullptr);
-
-        printf("Connections: self (%d, %d, %d), friends (%d, %d)\n",
-               tox_self_get_connection_status(tox1),
-               tox_self_get_connection_status(tox2),
-               tox_self_get_connection_status(tox3),
-               tox_friend_get_connection_status(tox2, 0, nullptr),
-               tox_friend_get_connection_status(tox3, 0, nullptr));
-        c_sleep(ITERATION_INTERVAL);
-    } while (tox_self_get_connection_status(tox1) == TOX_CONNECTION_NONE ||
-             tox_self_get_connection_status(tox2) == TOX_CONNECTION_NONE ||
-             tox_self_get_connection_status(tox3) == TOX_CONNECTION_NONE ||
-             tox_friend_get_connection_status(tox2, 0, nullptr) == TOX_CONNECTION_NONE ||
-             tox_friend_get_connection_status(tox3, 0, nullptr) == TOX_CONNECTION_NONE);
-
-    printf("Starting file transfer test: 100MiB file.\n");
-
-    file_accepted = file_size = sendf_ok = size_recv = 0;
-    file_recv = 0;
-    max_sending = UINT64_MAX;
-
-    printf("Starting file streaming transfer test.\n");
-
-    file_sending_done = 0;
-    file_accepted = 0;
-    file_size = 0;
-    sendf_ok = 0;
-    size_recv = 0;
-    file_recv = 0;
-    tox_callback_file_recv_chunk(tox3, write_file);
-    tox_callback_file_recv_control(tox2, file_print_control);
-    tox_callback_file_chunk_request(tox2, tox_file_chunk_request);
-    tox_callback_file_recv_control(tox3, file_print_control);
-    tox_callback_file_recv(tox3, tox_file_receive);
-    const uint64_t totalf_size = UINT64_MAX;
-    Tox_File_Number fnum = tox_file_send(
-                               tox2, 0, TOX_FILE_KIND_DATA, totalf_size, nullptr,
-                               (const uint8_t *)"Gentoo.exe", sizeof("Gentoo.exe"), nullptr);
-    ck_assert_msg(fnum != UINT32_MAX, "tox_new_file_sender fail");
-
-    Tox_Err_File_Get gfierr;
-    ck_assert_msg(!tox_file_get_file_id(tox2, 1, fnum, file_cmp_id, &gfierr), "tox_file_get_file_id didn't fail");
-    ck_assert_msg(gfierr == TOX_ERR_FILE_GET_FRIEND_NOT_FOUND, "wrong error");
-    ck_assert_msg(!tox_file_get_file_id(tox2, 0, fnum + 1, file_cmp_id, &gfierr), "tox_file_get_file_id didn't fail");
-    ck_assert_msg(gfierr == TOX_ERR_FILE_GET_NOT_FOUND, "wrong error");
-    ck_assert_msg(tox_file_get_file_id(tox2, 0, fnum, file_cmp_id, &gfierr), "tox_file_get_file_id failed");
-    ck_assert_msg(gfierr == TOX_ERR_FILE_GET_OK, "wrong error");
-
-    max_sending = 100 * 1024;
-    m_send_reached = 0;
-
-    do {
-        tox_iterate(tox1, nullptr);
-        tox_iterate(tox2, nullptr);
-        tox_iterate(tox3, nullptr);
-
-        uint32_t tox1_interval = tox_iteration_interval(tox1);
-        uint32_t tox2_interval = tox_iteration_interval(tox2);
-        uint32_t tox3_interval = tox_iteration_interval(tox3);
-
-        c_sleep(min_u32(tox1_interval, min_u32(tox2_interval, tox3_interval)));
-    } while (!file_sending_done);
-
-    ck_assert_msg(sendf_ok && file_recv && m_send_reached && totalf_size == file_size && size_recv == max_sending
-                  && sending_pos == size_recv && file_accepted == 1,
-                  "something went wrong in file transfer %u %u %u %u %u %u %u %lu %lu %lu %lu", sendf_ok, file_recv,
-                  m_send_reached, totalf_size == file_size, size_recv == max_sending, sending_pos == size_recv, file_accepted == 1,
-                  (unsigned long)totalf_size, (unsigned long)file_size,
-                  (unsigned long)size_recv, (unsigned long)sending_pos);
-
-    printf("file_transfer_test succeeded, took %llu seconds\n", time(nullptr) - cur_time);
-
-    tox_kill(tox1);
-    tox_kill(tox2);
-    tox_kill(tox3);
-}
-
-int main(void)
-{
-    setvbuf(stdout, nullptr, _IONBF, 0);
-    file_transfer_test();
-    return 0;
-}
--- a/auto_tests/tox_new_test.c
+++ b/auto_tests/tox_new_test.c
@ -1,9 +0,0 @@
-#include "../toxcore/tox.h"
-
-#include "../toxcore/ccompat.h"
-
-int main(void)
-{
-    tox_kill(tox_new(nullptr, nullptr));
-    return 0;
-}
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@ -1,15 +0,0 @@
-pool:
-  vmImage: "windows-2019"
-jobs:
-  - job: "windows_msvc_conan"
-    strategy:
-      matrix:
-        static:
-          conan.shared: "False"
-        shared:
-          conan.shared: "True"
-    steps:
-      - bash: python -m pip install conan==1.59.0
-      - bash: git submodule update --init --recursive
-      - bash: conan install -if _build -o with_tests=True -o shared=$(conan.shared) .
-      - bash: CONAN_CPU_COUNT=50 CTEST_OUTPUT_ON_FAILURE=1 conan build -bf _build -if _build . || true
--- a/cmake/Dependencies.cmake
+++ b/cmake/Dependencies.cmake
@ -1,36 +0,0 @@
-###############################################################################
-#
-# :: For systems that have pkg-config.
-#
-###############################################################################
-
-find_package(PkgConfig REQUIRED)
-
-find_library(NSL_LIBRARIES    nsl   )
-find_library(RT_LIBRARIES     rt    )
-find_library(SOCKET_LIBRARIES socket)
-
-find_package(pthreads QUIET)
-if(NOT TARGET PThreads4W::PThreads4W)
-  set(THREADS_PREFER_PTHREAD_FLAG ON)
-  find_package(Threads REQUIRED)
-endif()
-
-# For toxcore.
-pkg_search_module(LIBSODIUM   libsodium IMPORTED_TARGET REQUIRED)
-if(MSVC)
-  find_package(unofficial-sodium REQUIRED)
-endif()
-
-# For toxav.
-pkg_search_module(OPUS        opus      IMPORTED_TARGET)
-if(NOT OPUS_FOUND)
-  pkg_search_module(OPUS      Opus      IMPORTED_TARGET)
-endif()
-pkg_search_module(VPX         vpx       IMPORTED_TARGET)
-if(NOT VPX_FOUND)
-  pkg_search_module(VPX       libvpx    IMPORTED_TARGET)
-endif()
-
-# For tox-bootstrapd.
-pkg_search_module(LIBCONFIG   libconfig IMPORTED_TARGET)
--- a/cmake/ModulePackage.cmake
+++ b/cmake/ModulePackage.cmake
@ -1,65 +0,0 @@
-option(ENABLE_SHARED "Build shared (dynamic) libraries for all modules" ON)
-option(ENABLE_STATIC "Build static libraries for all modules" ON)
-
-if(NOT ENABLE_SHARED AND NOT ENABLE_STATIC)
-  message(WARNING
-    "Both static and shared libraries are disabled; "
-    "enabling only shared libraries. Use -DENABLE_SHARED or -DENABLE_STATIC to "
-    "select one manually.")
-  set(ENABLE_SHARED ON)
-endif()
-
-option(FULLY_STATIC "Build fully static executables" OFF)
-if(FULLY_STATIC)
-  set(CMAKE_EXE_LINKER_FLAGS "-static -no-pie")
-  # remove -Wl,-Bdynamic
-  set(CMAKE_EXE_LINK_DYNAMIC_C_FLAGS)
-  set(CMAKE_EXE_LINK_DYNAMIC_CXX_FLAGS)
-  set(ENABLE_SHARED OFF)
-  set(ENABLE_STATIC ON)
-endif()
-
-function(install_module lib)
-  if(TARGET ${lib}_shared)
-    set_target_properties(${lib}_shared PROPERTIES
-      VERSION ${SOVERSION}
-      SOVERSION ${SOVERSION_MAJOR}
-    )
-    install(TARGETS ${lib}_shared
-      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-  endif()
-  if(TARGET ${lib}_static)
-    install(TARGETS ${lib}_static
-      RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-      LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-      ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR})
-  endif()
-
-  string(REPLACE ";" " " ${lib}_PKGCONFIG_LIBS "${${lib}_PKGCONFIG_LIBS}")
-  string(REPLACE ";" " " ${lib}_PKGCONFIG_REQUIRES "${${lib}_PKGCONFIG_REQUIRES}")
-
-  configure_file(
-    "${${lib}_SOURCE_DIR}/other/pkgconfig/${lib}.pc.in"
-    "${CMAKE_BINARY_DIR}/${lib}.pc"
-    @ONLY
-  )
-
-  configure_file(
-    "${toxcore_SOURCE_DIR}/other/rpm/${lib}.spec.in"
-    "${CMAKE_BINARY_DIR}/${lib}.spec"
-    @ONLY
-  )
-
-  install(FILES
-    ${CMAKE_BINARY_DIR}/${lib}.pc
-    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
-
-  foreach(sublib ${${lib}_API_HEADERS})
-    string(REPLACE "^" ";" sublib ${sublib})
-    list(GET sublib 0 header)
-
-    install(FILES ${header} ${ARGN})
-  endforeach()
-endfunction()
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
+
+add_subdirectory(./entt)
+
+add_subdirectory(./solanaceae_util)
+add_subdirectory(./solanaceae_contact)
+add_subdirectory(./solanaceae_message3)
+
+add_subdirectory(./solanaceae_plugin)
+
+add_subdirectory(./toxcore)
+add_subdirectory(./solanaceae_toxcore)
+add_subdirectory(./solanaceae_tox)
+
+add_subdirectory(./sdl)
+add_subdirectory(./imgui)
+
+add_subdirectory(./stb)
+add_subdirectory(./libwebp)
+
--- a/external/entt/CMakeLists.txt
+++ b/external/entt/CMakeLists.txt
@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.9 FATAL_ERROR)
+
+add_subdirectory(./entt EXCLUDE_FROM_ALL)
+
--- a/external/entt/entt/.clang-format
+++ b/external/entt/entt/.clang-format
@ -0,0 +1,41 @@
+BasedOnStyle: llvm
+---
+AccessModifierOffset: -4
+AlignEscapedNewlines: DontAlign
+AllowShortBlocksOnASingleLine: Empty
+AllowShortEnumsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: WithoutElse
+AllowShortLoopsOnASingleLine: true
+AlwaysBreakTemplateDeclarations: Yes
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeTernaryOperators: true
+ColumnLimit: 0
+DerivePointerAlignment: false
+IncludeCategories:
+  - Regex: '<[[:alnum:]_]+>'
+    Priority: 1
+  - Regex: '<(gtest|gmock)/'
+    Priority: 2
+  - Regex: '<[[:alnum:]_./]+>'
+    Priority: 3
+  - Regex: '<entt/'
+    Priority: 4
+  - Regex: '.*'
+    Priority: 5
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+KeepEmptyLinesAtTheStartOfBlocks: false
+Language: Cpp
+PointerAlignment: Right
+SpaceAfterCStyleCast: false
+SpaceAfterTemplateKeyword: false
+SpaceAroundPointerQualifiers: After
+SpaceBeforeCaseColon: false
+SpaceBeforeCtorInitializerColon: false
+SpaceBeforeInheritanceColon: false
+SpaceBeforeParens: Never
+SpaceBeforeRangeBasedForLoopColon: false
+Standard: Latest
+TabWidth: 4
+UseTab: Never
--- a/external/entt/entt/.github/FUNDING.yml
+++ b/external/entt/entt/.github/FUNDING.yml
@ -0,0 +1,4 @@
+# These are supported funding model platforms
+
+github: skypjack
+custom: https://www.paypal.me/skypjack
--- a/external/entt/entt/.github/workflows/analyzer.yml
+++ b/external/entt/entt/.github/workflows/analyzer.yml
@ -0,0 +1,55 @@
+name: analyzer
+
+on:
+  push:
+    branches:
+      - master
+      - wip
+
+jobs:
+
+  iwyu:
+    timeout-minutes: 30
+
+    env:
+      IWYU: 0.18
+      LLVM: 14
+
+    runs-on: ubuntu-latest
+    continue-on-error: true
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install llvm/clang
+      # see: https://apt.llvm.org/
+      run: |
+        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+        sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-$LLVM main"
+        sudo apt update
+        sudo apt remove -y "llvm*"
+        sudo apt remove -y "libclang-dev*"
+        sudo apt remove -y "clang*"
+        sudo apt install -y llvm-$LLVM-dev
+        sudo apt install -y libclang-$LLVM-dev
+        sudo apt install -y clang-$LLVM
+    - name: Compile iwyu
+      # see: https://github.com/include-what-you-use/include-what-you-use
+      working-directory: build
+      run: |
+        git clone https://github.com/include-what-you-use/include-what-you-use.git --branch $IWYU --depth 1
+        mkdir include-what-you-use/build
+        cd include-what-you-use/build
+        cmake -DCMAKE_C_COMPILER=clang-$LLVM -DCMAKE_CXX_COMPILER=clang++-$LLVM -DCMAKE_INSTALL_PREFIX=./ ..
+        make -j4
+        bin/include-what-you-use --version
+    - name: Compile tests
+      working-directory: build
+      run: |
+        export PATH=$PATH:${GITHUB_WORKSPACE}/build/include-what-you-use/build/bin
+        cmake -DENTT_BUILD_TESTING=ON \
+              -DENTT_BUILD_BENCHMARK=ON \
+              -DENTT_BUILD_EXAMPLE=ON \
+              -DENTT_BUILD_LIB=ON \
+              -DENTT_BUILD_SNAPSHOT=ON \
+              -DCMAKE_CXX_INCLUDE_WHAT_YOU_USE="include-what-you-use;-Xiwyu;--mapping_file=${GITHUB_WORKSPACE}/entt.imp;-Xiwyu;--no_fwd_decls;-Xiwyu;--verbose=1" ..
+        make -j4
--- a/external/entt/entt/.github/workflows/build.yml
+++ b/external/entt/entt/.github/workflows/build.yml
@ -0,0 +1,169 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+
+  linux:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        compiler:
+          - pkg: g++-7
+            exe: g++-7
+          - pkg: g++-8
+            exe: g++-8
+          - pkg: g++-9
+            exe: g++-9
+          - pkg: g++-10
+            exe: g++-10
+          - pkg: clang-8
+            exe: clang++-8
+          - pkg: clang-9
+            exe: clang++-9
+          - pkg: clang-10
+            exe: clang++-10
+          - pkg: clang-11
+            exe: clang++-11
+          - pkg: clang-12
+            exe: clang++-12
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install compiler
+      run: |
+        sudo apt update
+        sudo apt install -y ${{ matrix.compiler.pkg }}
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXX: ${{ matrix.compiler.exe }}
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  linux-extra:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        compiler: [g++, clang++]
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXX: ${{ matrix.compiler }}
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  windows:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        toolset: [default, v141, v142, clang-cl]
+        include:
+          - toolset: v141
+            toolset_option: -T"v141"
+          - toolset: v142
+            toolset_option: -T"v142"
+          - toolset: clang-cl
+            toolset_option: -T"ClangCl"
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ${{ matrix.toolset_option }} ..
+        cmake --build . -j 4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  windows-extra:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        cmake --build . -j 4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  macos:
+    timeout-minutes: 15
+    runs-on: macOS-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+
+  macos-extra:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: macOS-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
--- a/external/entt/entt/.github/workflows/coverage.yml
+++ b/external/entt/entt/.github/workflows/coverage.yml
@ -0,0 +1,38 @@
+name: coverage
+
+on: [push, pull_request]
+
+jobs:
+
+  codecov:
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXXFLAGS: "--coverage -fno-inline"
+        CXX: g++
+      run: |
+        cmake -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
+    - name: Collect data
+      working-directory: build
+      run: |
+        sudo apt install lcov
+        lcov -c -d . -o coverage.info
+        lcov -l coverage.info
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v2
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        files: build/coverage.info
+        name: EnTT
+        fail_ci_if_error: true
--- a/external/entt/entt/.github/workflows/deploy.yml
+++ b/external/entt/entt/.github/workflows/deploy.yml
@ -0,0 +1,39 @@
+name: deploy
+
+on:
+  release:
+    types: published
+
+jobs:
+
+  homebrew-entt:
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+
+    env:
+      GH_REPO: homebrew-entt
+      FORMULA: entt.rb
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Clone repository
+      working-directory: build
+      env:
+        PERSONAL_ACCESS_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN }}
+      run: git clone https://$GITHUB_ACTOR:$PERSONAL_ACCESS_TOKEN@github.com/$GITHUB_ACTOR/$GH_REPO.git
+    - name: Prepare formula
+      working-directory: build
+      run: |
+        cd $GH_REPO
+        curl "https://github.com/${{ github.repository }}/archive/${{ github.ref }}.tar.gz" --location --fail --silent --show-error --output archive.tar.gz
+        sed -i -e '/url/s/".*"/"'$(echo "https://github.com/${{ github.repository }}/archive/${{ github.ref }}.tar.gz" | sed -e 's/[\/&]/\\&/g')'"/' $FORMULA
+        sed -i -e '/sha256/s/".*"/"'$(openssl sha256 archive.tar.gz | cut -d " " -f 2)'"/' $FORMULA
+    - name: Update remote
+      working-directory: build
+      run: |
+        cd $GH_REPO
+        git config --local user.email "action@github.com"
+        git config --local user.name "$GITHUB_ACTOR"
+        git add $FORMULA
+        git commit -m "Update to ${{ github.ref }}"
+        git push origin master
--- a/external/entt/entt/.github/workflows/sanitizer.yml
+++ b/external/entt/entt/.github/workflows/sanitizer.yml
@ -0,0 +1,31 @@
+name: sanitizer
+
+on: [push, pull_request]
+
+jobs:
+
+  clang:
+    timeout-minutes: 15
+
+    strategy:
+      matrix:
+        compiler: [clang++]
+        id_type: ["std::uint32_t", "std::uint64_t"]
+        cxx_std: [cxx_std_17, cxx_std_20]
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Compile tests
+      working-directory: build
+      env:
+        CXX: ${{ matrix.compiler }}
+      run: |
+        cmake -DENTT_USE_SANITIZER=ON -DENTT_BUILD_TESTING=ON -DENTT_BUILD_LIB=ON -DENTT_BUILD_EXAMPLE=ON -DENTT_CXX_STD=${{ matrix.cxx_std }} -DENTT_ID_TYPE=${{ matrix.id_type }} ..
+        make -j4
+    - name: Run tests
+      working-directory: build
+      env:
+        CTEST_OUTPUT_ON_FAILURE: 1
+      run: ctest --timeout 30 -C Debug -j4
--- a/external/entt/entt/.gitignore
+++ b/external/entt/entt/.gitignore
@ -0,0 +1,13 @@
+# Conan
+conan/test_package/build
+
+# IDEs
+*.user
+.idea
+.vscode
+.vs
+CMakeSettings.json
+cpp.hint
+
+# Bazel
+/bazel-*
--- a/external/entt/entt/AUTHORS
+++ b/external/entt/entt/AUTHORS
@ -0,0 +1,56 @@
+# Author
+
+skypjack
+
+# Contributors
+
+alexames
+BenediktConze
+bjadamson
+ceeac
+ColinH
+corystegel
+Croydon
+cschreib
+cugone
+dbacchet
+dBagrat
+djarek
+DNKpp
+DonKult
+drglove
+eliasdaler
+erez-o
+eugeneko
+gale83
+ghost
+grdowns
+Green-Sky
+Innokentiy-Alaytsev
+Kerndog73
+Koward
+Lawrencemm
+markand
+mhammerc
+Milerius
+Minimonium
+morbo84
+m-waka
+netpoetica
+NixAJ
+Oortonaut
+Paolo-Oliverio
+pgruenbacher
+prowolf
+Qix-
+stefanofiorentino
+suVrik
+szunhammer
+The5-1
+vblanco20-1
+willtunnels
+WizardIke
+WoLfulus 
+w1th0utnam3
+xissburg
+zaucy
--- a/external/entt/entt/BUILD.bazel
+++ b/external/entt/entt/BUILD.bazel
@ -0,0 +1,14 @@
+_msvc_copts = ["/std:c++17"]	
+_gcc_copts = ["-std=c++17"]
+
+cc_library(
+    name = "entt",
+    visibility = ["//visibility:public"],
+    strip_include_prefix = "src",
+    hdrs = glob(["src/**/*.h", "src/**/*.hpp"]),
+    copts = select({
+      "@bazel_tools//src/conditions:windows": _msvc_copts,
+      "@bazel_tools//src/conditions:windows_msvc": _msvc_copts,
+      "//conditions:default": _gcc_copts,
+    }),
+)
--- a/external/entt/entt/CMakeLists.txt
+++ b/external/entt/entt/CMakeLists.txt
@ -0,0 +1,325 @@
+#
+# EnTT
+#
+
+cmake_minimum_required(VERSION 3.12.4)
+
+#
+# Read project version
+#
+
+set(ENTT_VERSION_REGEX "#define ENTT_VERSION_.*[ \t]+(.+)")
+file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/src/entt/config/version.h" ENTT_VERSION REGEX ${ENTT_VERSION_REGEX})
+list(TRANSFORM ENTT_VERSION REPLACE ${ENTT_VERSION_REGEX} "\\1")
+string(JOIN "." ENTT_VERSION ${ENTT_VERSION})
+
+#
+# Project configuration
+#
+
+project(
+    EnTT
+    VERSION ${ENTT_VERSION}
+    DESCRIPTION "Gaming meets modern C++ - a fast and reliable entity-component system (ECS) and much more"
+    HOMEPAGE_URL "https://github.com/skypjack/entt"
+    LANGUAGES C CXX
+)
+
+if(NOT CMAKE_BUILD_TYPE)
+    set(CMAKE_BUILD_TYPE Debug)
+endif()
+
+message(VERBOSE "*")
+message(VERBOSE "* ${PROJECT_NAME} v${PROJECT_VERSION} (${CMAKE_BUILD_TYPE})")
+message(VERBOSE "* Copyright (c) 2017-2022 Michele Caini <michele.caini@gmail.com>")
+message(VERBOSE "*")
+
+#
+# CMake stuff
+#
+
+list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules)
+
+#
+# Compiler stuff
+#
+
+option(ENTT_USE_LIBCPP "Use libc++ by adding -stdlib=libc++ flag if available." OFF)
+option(ENTT_USE_SANITIZER "Enable sanitizers by adding -fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined flags if available." OFF)
+
+if(ENTT_USE_LIBCPP)
+    if(NOT WIN32)
+        include(CheckCXXSourceCompiles)
+        include(CMakePushCheckState)
+
+        cmake_push_check_state()
+
+        set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -stdlib=libc++")
+
+        check_cxx_source_compiles("
+            #include<type_traits>
+            int main() { return std::is_same_v<int, char>; }
+        " ENTT_HAS_LIBCPP)
+
+        cmake_pop_check_state()
+    endif()
+
+    if(NOT ENTT_HAS_LIBCPP)
+        message(VERBOSE "The option ENTT_USE_LIBCPP is set but libc++ is not available. The flag will not be added to the target.")
+    endif()
+endif()
+
+if(ENTT_USE_SANITIZER)
+    if(CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
+        set(ENTT_HAS_SANITIZER TRUE CACHE BOOL "" FORCE)
+        mark_as_advanced(ENTT_HAS_SANITIZER)
+    endif()
+
+    if(NOT ENTT_HAS_SANITIZER)
+        message(VERBOSE "The option ENTT_USE_SANITIZER is set but sanitizer support is not available. The flags will not be added to the target.")
+    endif()
+endif()
+
+#
+# Add EnTT target
+#
+
+option(ENTT_INCLUDE_HEADERS "Add all EnTT headers to the EnTT target." OFF)
+option(ENTT_INCLUDE_NATVIS "Add EnTT natvis files to the EnTT target." OFF)
+
+if(ENTT_INCLUDE_NATVIS)
+    if(MSVC)
+        set(ENTT_HAS_NATVIS TRUE CACHE BOOL "" FORCE)
+        mark_as_advanced(ENTT_HAS_NATVIS)
+    endif()
+
+    if(NOT ENTT_HAS_NATVIS)
+        message(VERBOSE "The option ENTT_INCLUDE_NATVIS is set but natvis files are not supported. They will not be added to the target.")
+    endif()
+endif()
+
+include(GNUInstallDirs)
+
+add_library(EnTT INTERFACE)
+add_library(EnTT::EnTT ALIAS EnTT)
+
+target_include_directories(
+    EnTT
+    INTERFACE
+        $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+)
+
+target_compile_features(EnTT INTERFACE cxx_std_17)
+
+if(ENTT_INCLUDE_HEADERS)
+    target_sources(
+        EnTT
+        INTERFACE
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/config/config.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/config/macro.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/config/version.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/container/dense_map.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/container/dense_set.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/container/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/algorithm.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/any.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/attribute.h>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/compressed_pair.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/enum.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/family.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/hashed_string.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/ident.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/iterator.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/memory.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/monostate.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/tuple.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/type_info.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/type_traits.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/core/utility.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/component.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/entity.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/group.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/handle.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/helper.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/observer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/organizer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/registry.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/runtime_view.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/snapshot.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/sparse_set.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/storage.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/storage_mixin.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entity/view.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/adjacency_matrix.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/dot.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/flow.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/graph/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/locator/locator.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/adl_pointer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/container.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/context.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/factory.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/meta.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/node.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/pointer.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/policy.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/range.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/resolve.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/template.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/type_traits.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/meta/utility.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/platform/android-ndk-r17.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/poly/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/poly/poly.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/process/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/process/process.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/process/scheduler.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/cache.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/loader.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/resource/resource.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/delegate.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/dispatcher.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/emitter.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/fwd.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/signal/sigh.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/entt.hpp>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/src/entt/fwd.hpp>
+    )
+endif()
+
+if(ENTT_HAS_NATVIS)
+    target_sources(
+        EnTT
+        INTERFACE
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/config.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/container.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/core.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/entity.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/graph.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/locator.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/meta.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/platform.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/poly.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/process.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/resource.natvis>
+            $<BUILD_INTERFACE:${EnTT_SOURCE_DIR}/natvis/entt/signal.natvis>
+    )
+endif()
+
+if(ENTT_HAS_SANITIZER)
+    target_compile_options(EnTT INTERFACE $<$<CONFIG:Debug>:-fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined>)
+    target_link_libraries(EnTT INTERFACE $<$<CONFIG:Debug>:-fsanitize=address -fno-omit-frame-pointer -fsanitize=undefined>)
+endif()
+
+if(ENTT_HAS_LIBCPP)
+    target_compile_options(EnTT BEFORE INTERFACE -stdlib=libc++)
+endif()
+
+#
+# Install pkg-config file
+#
+
+include(JoinPaths)
+
+set(EnTT_PKGCONFIG ${CMAKE_CURRENT_BINARY_DIR}/entt.pc)
+
+join_paths(EnTT_PKGCONFIG_INCLUDEDIR "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
+
+configure_file(
+    ${EnTT_SOURCE_DIR}/cmake/in/entt.pc.in
+    ${EnTT_PKGCONFIG}
+    @ONLY
+)
+
+install(
+    FILES ${EnTT_PKGCONFIG}
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+)
+
+#
+# Install EnTT
+#
+
+include(CMakePackageConfigHelpers)
+
+install(
+    TARGETS EnTT
+    EXPORT EnTTTargets
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+write_basic_package_version_file(
+    EnTTConfigVersion.cmake
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion
+)
+
+configure_package_config_file(
+    ${EnTT_SOURCE_DIR}/cmake/in/EnTTConfig.cmake.in
+    EnTTConfig.cmake
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/EnTT/cmake
+)
+
+export(
+    EXPORT EnTTTargets
+    FILE ${CMAKE_CURRENT_BINARY_DIR}/EnTTTargets.cmake
+    NAMESPACE EnTT::
+)
+
+install(
+    EXPORT EnTTTargets
+    FILE EnTTTargets.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/EnTT/cmake
+    NAMESPACE EnTT::
+)
+
+install(
+    FILES
+        ${PROJECT_BINARY_DIR}/EnTTConfig.cmake
+        ${PROJECT_BINARY_DIR}/EnTTConfigVersion.cmake
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/EnTT/cmake
+)
+
+install(DIRECTORY src/ DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
+
+export(PACKAGE EnTT)
+
+#
+# Tests
+#
+
+option(ENTT_BUILD_TESTING "Enable building tests." OFF)
+
+if(ENTT_BUILD_TESTING)
+    option(ENTT_FIND_GTEST_PACKAGE "Enable finding gtest package." OFF)
+    option(ENTT_BUILD_BENCHMARK "Build benchmark." OFF)
+    option(ENTT_BUILD_EXAMPLE "Build examples." OFF)
+    option(ENTT_BUILD_LIB "Build lib tests." OFF)
+    option(ENTT_BUILD_SNAPSHOT "Build snapshot test with Cereal." OFF)
+
+    set(ENTT_ID_TYPE std::uint32_t CACHE STRING "Type of identifiers to use for the tests")
+    set(ENTT_CXX_STD cxx_std_17 CACHE STRING "C++ standard revision to use for the tests")
+
+    include(CTest)
+    enable_testing()
+    add_subdirectory(test)
+endif()
+
+#
+# Documentation
+#
+
+option(ENTT_BUILD_DOCS "Enable building with documentation." OFF)
+
+if(ENTT_BUILD_DOCS)
+    find_package(Doxygen 1.8)
+
+    if(DOXYGEN_FOUND)
+        add_subdirectory(docs)
+    endif()
+endif()
--- a/external/entt/entt/CONTRIBUTING.md
+++ b/external/entt/entt/CONTRIBUTING.md
@ -0,0 +1,43 @@
+# Contributing
+
+First of all, thank you very much for taking the time to contribute to the
+`EnTT` library.<br/>
+How to do it mostly depends on the type of contribution:
+
+* If you have a question, **please** ensure there isn't already an answer for
+  you by searching on GitHub under
+  [issues](https://github.com/skypjack/entt/issues). Do not forget to search
+  also through the closed ones. If you are unable to find a proper answer, feel
+  free to [open a new issue](https://github.com/skypjack/entt/issues/new).
+  Usually, questions are marked as such and closed in a few days.
+
+* If you want to fix a typo in the inline documentation or in the README file,
+  if you want to add some new sections or if you want to help me with the
+  language by reviewing what I wrote so far (I'm not a native speaker after
+  all), **please** open a new
+  [pull request](https://github.com/skypjack/entt/pulls) with your changes.
+
+* If you found a bug, **please** ensure there isn't already an answer for you by
+  searching on GitHub under [issues](https://github.com/skypjack/entt/issues).
+  If you are unable to find an open issue addressing the problem, feel free to
+  [open a new one](https://github.com/skypjack/entt/issues/new). **Please**, do
+  not forget to carefully describe how to reproduce the problem, then add all
+  the information about the system on which you are experiencing it and point
+  out the version of `EnTT` you are using (tag or commit).
+
+* If you found a bug and you wrote a patch to fix it, open a new
+  [pull request](https://github.com/skypjack/entt/pulls) with your code.
+  **Please**, add some tests to avoid regressions in future if possible, it
+  would be really appreciated. Note that the `EnTT` library has a
+  [coverage at 100%](https://coveralls.io/github/skypjack/entt?branch=master)
+  (at least it was at 100% at the time I wrote this file) and this is the reason
+  for which you can be confident with using it in a production environment.
+
+* If you want to propose a new feature and you know how to code it, **please**
+  do not issue directly a pull request. Before to do it,
+  [create a new issue](https://github.com/skypjack/entt/issues/new) to discuss
+  your proposal. Other users could be interested in your idea and the discussion
+  that will follow can refine it and therefore give us a better solution.
+
+* If you want to request a new feature, I'm available for hiring. Take a look at
+  [my profile](https://github.com/skypjack) and feel free to write me.
--- a/external/entt/entt/LICENSE
+++ b/external/entt/entt/LICENSE
@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2017-2022 Michele Caini, author of EnTT
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copy of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copy or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/external/entt/entt/README.md
+++ b/external/entt/entt/README.md
@ -0,0 +1,431 @@
+![EnTT: Gaming meets modern C++](https://user-images.githubusercontent.com/1812216/103550016-90752280-4ea8-11eb-8667-12ed2219e137.png)
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+[![Build Status](https://github.com/skypjack/entt/workflows/build/badge.svg)](https://github.com/skypjack/entt/actions)
+[![Coverage](https://codecov.io/gh/skypjack/entt/branch/master/graph/badge.svg)](https://codecov.io/gh/skypjack/entt)
+[![Try online](https://img.shields.io/badge/try-online-brightgreen)](https://godbolt.org/z/zxW73f)
+[![Documentation](https://img.shields.io/badge/docs-docsforge-blue)](http://entt.docsforge.com/)
+[![Gitter chat](https://badges.gitter.im/skypjack/entt.png)](https://gitter.im/skypjack/entt)
+[![Discord channel](https://img.shields.io/discord/707607951396962417?logo=discord)](https://discord.gg/5BjPWBd)
+[![Donate](https://img.shields.io/badge/donate-paypal-blue.svg)](https://www.paypal.me/skypjack)
+
+> `EnTT` has been a dream so far, we haven't found a single bug to date and it's
+> super easy to work with
+>
+> -- Every EnTT User Ever
+
+`EnTT` is a header-only, tiny and easy to use library for game programming and
+much more written in **modern C++**.<br/>
+[Among others](https://github.com/skypjack/entt/wiki/EnTT-in-Action), it's used
+in [**Minecraft**](https://minecraft.net/en-us/attribution/) by Mojang, the
+[**ArcGIS Runtime SDKs**](https://developers.arcgis.com/arcgis-runtime/) by Esri
+and the amazing [**Ragdoll**](https://ragdolldynamics.com/).<br/>
+If you don't see your project in the list, please open an issue, submit a PR or
+add the [#entt](https://github.com/topics/entt) tag to your _topics_! :+1:
+
+---
+
+Do you want to **keep up with changes** or do you have a **question** that
+doesn't require you to open an issue?<br/>
+Join the [gitter channel](https://gitter.im/skypjack/entt) and the
+[discord server](https://discord.gg/5BjPWBd), meet other users like you. The
+more we are, the better for everyone.<br/>
+Don't forget to check the
+[FAQs](https://github.com/skypjack/entt/wiki/Frequently-Asked-Questions) and the
+[wiki](https://github.com/skypjack/entt/wiki) too. Your answers may already be
+there.
+
+Do you want to support `EnTT`? Consider becoming a
+[**sponsor**](https://github.com/users/skypjack/sponsorship).
+Many thanks to [these people](https://skypjack.github.io/sponsorship/) and
+**special** thanks to:
+
+[![mojang](https://user-images.githubusercontent.com/1812216/106253145-67ca1980-6217-11eb-9c0b-d93561b37098.png)](https://mojang.com)
+[![imgly](https://user-images.githubusercontent.com/1812216/106253726-271ed000-6218-11eb-98e0-c9c681925770.png)](https://img.ly/)
+
+# Table of Contents
+
+* [Introduction](#introduction)
+  * [Code Example](#code-example)
+  * [Motivation](#motivation)
+  * [Performance](#performance)
+* [Integration](#integration)
+  * [Requirements](#requirements)
+  * [CMake](#cmake)
+  * [Natvis support](#natvis-support)
+  * [Packaging Tools](#packaging-tools)
+  * [pkg-config](#pkg-config)
+* [Documentation](#documentation)
+* [Tests](#tests)
+* [EnTT in Action](#entt-in-action)
+* [Contributors](#contributors)
+* [License](#license)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+The entity-component-system (also known as _ECS_) is an architectural pattern
+used mostly in game development. For further details:
+
+* [Entity Systems Wiki](http://entity-systems.wikidot.com/)
+* [Evolve Your Hierarchy](http://cowboyprogramming.com/2007/01/05/evolve-your-heirachy/)
+* [ECS on Wikipedia](https://en.wikipedia.org/wiki/Entity%E2%80%93component%E2%80%93system)
+
+This project started off as a pure entity-component system. Over time the
+codebase has grown as more and more classes and functionalities were added.<br/>
+Here is a brief, yet incomplete list of what it offers today:
+
+* Built-in **RTTI system** mostly similar to the standard one.
+* A `constexpr` utility for human-readable **resource names**.
+* Minimal **configuration system** built using the monostate pattern.
+* Incredibly fast **entity-component system** with its own _pay for what you
+  use_ policy, unconstrained component types with optional pointer stability and
+  hooks for storage customization.
+* Views and groups to iterate entities and components and allow different access
+  patterns, from **perfect SoA** to fully random.
+* A lot of **facilities** built on top of the entity-component system to help
+  the users and avoid reinventing the wheel.
+* General purpose **execution graph builder** for optimal scheduling.
+* The smallest and most basic implementation of a **service locator** ever seen.
+* A built-in, non-intrusive and macro-free runtime **reflection system**.
+* **Static polymorphism** made simple and within everyone's reach.
+* A few homemade containers, like a sparse set based **hash map**.
+* A **cooperative scheduler** for processes of any type.
+* All that is needed for **resource management** (cache, loaders, handles).
+* Delegates, **signal handlers** and a tiny event dispatcher.
+* A general purpose **event emitter** as a CRTP idiom based class template.
+* And **much more**! Check out the
+  [**wiki**](https://github.com/skypjack/entt/wiki).
+
+Consider this list a work in progress as well as the project. The whole API is
+fully documented in-code for those who are brave enough to read it.<br/>
+Please, do note that all tools are also DLL-friendly now and run smoothly across
+boundaries.
+
+One thing known to most is that `EnTT` is also used in **Minecraft**.<br/>
+Given that the game is available literally everywhere, I can confidently say 
+that the library has been sufficiently tested on every platform that can come to 
+mind.
+
+## Code Example
+
+```cpp
+#include <entt/entt.hpp>
+
+struct position {
+    float x;
+    float y;
+};
+
+struct velocity {
+    float dx;
+    float dy;
+};
+
+void update(entt::registry &registry) {
+    auto view = registry.view<const position, velocity>();
+
+    // use a callback
+    view.each([](const auto &pos, auto &vel) { /* ... */ });
+
+    // use an extended callback
+    view.each([](const auto entity, const auto &pos, auto &vel) { /* ... */ });
+
+    // use a range-for
+    for(auto [entity, pos, vel]: view.each()) {
+        // ...
+    }
+
+    // use forward iterators and get only the components of interest
+    for(auto entity: view) {
+        auto &vel = view.get<velocity>(entity);
+        // ...
+    }
+}
+
+int main() {
+    entt::registry registry;
+
+    for(auto i = 0u; i < 10u; ++i) {
+        const auto entity = registry.create();
+        registry.emplace<position>(entity, i * 1.f, i * 1.f);
+        if(i % 2 == 0) { registry.emplace<velocity>(entity, i * .1f, i * .1f); }
+    }
+
+    update(registry);
+}
+```
+
+## Motivation
+
+I started developing `EnTT` for the _wrong_ reason: my goal was to design an
+entity-component system to beat another well known open source library both in
+terms of performance and possibly memory usage.<br/>
+In the end, I did it, but it wasn't very satisfying. Actually it wasn't
+satisfying at all. The fastest and nothing more, fairly little indeed. When I
+realized it, I tried hard to keep intact the great performance of `EnTT` and to
+add all the features I wanted to see in *my own library* at the same time.
+
+Nowadays, `EnTT` is finally what I was looking for: still faster than its
+_competitors_, lower memory usage in the average case, a really good API and an
+amazing set of features. And even more, of course.
+
+## Performance
+
+The proposed entity-component system is incredibly fast to iterate entities and
+components, this is a fact. Some compilers make a lot of optimizations because
+of how `EnTT` works, some others aren't that good. In general, if we consider
+real world cases, `EnTT` is somewhere between a bit and much faster than many of
+the other solutions around, although I couldn't check them all for obvious
+reasons.
+
+If you are interested, you can compile the `benchmark` test in release mode (to
+enable compiler optimizations, otherwise it would make little sense) by setting
+the `ENTT_BUILD_BENCHMARK` option of `CMake` to `ON`, then evaluate yourself
+whether you're satisfied with the results or not.
+
+Honestly I got tired of updating the README file whenever there is an
+improvement.<br/>
+There are already a lot of projects out there that use `EnTT` as a basis for
+comparison (this should already tell you a lot). Many of these benchmarks are
+completely wrong, many others are simply incomplete, good at omitting some
+information and using the wrong function to compare a given feature. Certainly
+there are also good ones but they age quickly if nobody updates them, especially
+when the library they are dealing with is actively developed.
+
+The choice to use `EnTT` should be based on its carefully designed API, its
+set of features and the general performance, **not** because some single
+benchmark shows it to be the fastest tool available.
+
+In the future I'll likely try to get even better performance while still adding
+new features, mainly for fun.<br/>
+If you want to contribute and/or have suggestions, feel free to make a PR or
+open an issue to discuss your idea.
+
+# Integration
+
+`EnTT` is a header-only library. This means that including the `entt.hpp` header
+is enough to include the library as a whole and use it. For those who are
+interested only in the entity-component system, consider to include the sole
+`entity/registry.hpp` header instead.<br/>
+It's a matter of adding the following line to the top of a file:
+
+```cpp
+#include <entt/entt.hpp>
+```
+
+Use the line below to include only the entity-component system instead:
+
+```cpp
+#include <entt/entity/registry.hpp>
+```
+
+Then pass the proper `-I` argument to the compiler to add the `src` directory to
+the include paths.
+
+## Requirements
+
+To be able to use `EnTT`, users must provide a full-featured compiler that
+supports at least C++17.<br/>
+The requirements below are mandatory to compile the tests and to extract the
+documentation:
+
+* `CMake` version 3.7 or later.
+* `Doxygen` version 1.8 or later.
+
+Alternatively, [Bazel](https://bazel.build) is also supported as a build system
+(credits to [zaucy](https://github.com/zaucy) who offered to maintain it).<br/>
+In the documentation below I'll still refer to `CMake`, this being the official
+build system of the library.
+
+## CMake
+
+To use `EnTT` from a `CMake` project, just link an existing target to the
+`EnTT::EnTT` alias.<br/>
+The library offers everything you need for locating (as in `find_package`),
+embedding (as in `add_subdirectory`), fetching (as in `FetchContent`) or using
+it in many of the ways that you can think of and that involve `CMake`.<br/>
+Covering all possible cases would require a treaty and not a simple README file,
+but I'm confident that anyone reading this section also knows what it's about
+and can use `EnTT` from a `CMake` project without problems.
+
+## Natvis support
+
+When using `CMake`, just enable the option `ENTT_INCLUDE_NATVIS` and enjoy
+it.<br/>
+Otherwise, most of the tools are covered via Natvis and all files can be found
+in the `natvis` directory, divided by module.<br/>
+If you spot errors or have suggestions, any contribution is welcome!
+
+## Packaging Tools
+
+`EnTT` is available for some of the most known packaging tools. In particular:
+
+* [`Conan`](https://github.com/conan-io/conan-center-index), the C/C++ Package
+  Manager for Developers.
+
+* [`vcpkg`](https://github.com/Microsoft/vcpkg), Microsoft VC++ Packaging
+  Tool.<br/>
+  You can download and install `EnTT` in just a few simple steps:
+
+  ```
+  $ git clone https://github.com/Microsoft/vcpkg.git
+  $ cd vcpkg
+  $ ./bootstrap-vcpkg.sh
+  $ ./vcpkg integrate install
+  $ vcpkg install entt
+  ```
+
+  Or you can use the `experimental` feature to test the latest changes:
+
+  ```
+  vcpkg install entt[experimental] --head
+  ```
+
+  The `EnTT` port in `vcpkg` is kept up to date by Microsoft team members and
+  community contributors.<br/>
+  If the version is out of date, please
+  [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the
+  `vcpkg` repository.
+
+* [`Homebrew`](https://github.com/skypjack/homebrew-entt), the missing package
+  manager for macOS.<br/>
+  Available as a homebrew formula. Just type the following to install it:
+
+  ```
+  brew install skypjack/entt/entt
+  ```
+
+* [`build2`](https://build2.org), build toolchain for developing and packaging C
+  and C++ code.<br/>
+  In order to use the [`entt`](https://cppget.org/entt) package in a `build2`
+  project, add the following line or a similar one to the `manifest` file:
+
+  ```
+  depends: entt ^3.0.0
+  ```
+
+  Also check that the configuration refers to a valid repository, so that the
+  package can be found by `build2`:
+
+  * [`cppget.org`](https://cppget.org), the open-source community central
+    repository, accessible as `https://pkg.cppget.org/1/stable`.
+
+  * [Package source repository](https://github.com/build2-packaging/entt):
+    accessible as either `https://github.com/build2-packaging/entt.git` or
+    `ssh://git@github.com/build2-packaging/entt.git`.
+    Feel free to [report issues](https://github.com/build2-packaging/entt) with
+    this package.
+
+  Both can be used with `bpkg add-repo` or added in a project
+  `repositories.manifest`. See the official
+  [documentation](https://build2.org/build2-toolchain/doc/build2-toolchain-intro.xhtml#guide-repositories)
+  for more details.
+
+Consider this list a work in progress and help me to make it longer if you like.
+
+## pkg-config
+
+`EnTT` also supports `pkg-config` (for some definition of _supports_ at least).
+A suitable file called `entt.pc` is generated and installed in a proper
+directory when running `CMake`.<br/>
+This should also make it easier to use with tools such as `Meson` or similar.
+
+# Documentation
+
+The documentation is based on [doxygen](http://www.doxygen.nl/). To build it:
+
+    $ cd build
+    $ cmake .. -DENTT_BUILD_DOCS=ON
+    $ make
+
+The API reference will be created in HTML format within the directory
+`build/docs/html`. To navigate it with your favorite browser:
+
+    $ cd build
+    $ your_favorite_browser docs/html/index.html
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+The same version is also available [online](https://skypjack.github.io/entt/)
+for the latest release, that is the last stable tag. If you are looking for
+something more pleasing to the eye, consider reading the nice-looking version
+available on [docsforge](https://entt.docsforge.com/): same documentation, much
+more pleasant to read.<br/>
+Moreover, there exists a [wiki](https://github.com/skypjack/entt/wiki) dedicated
+to the project where users can find all related documentation pages.
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Tests
+
+To compile and run the tests, `EnTT` requires *googletest*.<br/>
+`cmake` will download and compile the library before compiling anything else.
+In order to build the tests, set the `CMake` option `ENTT_BUILD_TESTING` to
+`ON`.
+
+To build the most basic set of tests:
+
+* `$ cd build`
+* `$ cmake -DENTT_BUILD_TESTING=ON ..`
+* `$ make`
+* `$ make test`
+
+Note that benchmarks are not part of this set.
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# EnTT in Action
+
+`EnTT` is widely used in private and commercial applications. I cannot even
+mention most of them because of some signatures I put on some documents time
+ago. Fortunately, there are also people who took the time to implement open
+source projects based on `EnTT` and did not hold back when it came to
+documenting them.
+
+[Here](https://github.com/skypjack/entt/wiki/EnTT-in-Action) you can find an
+incomplete list of games, applications and articles that can be used as a
+reference.
+
+If you know of other resources out there that are about `EnTT`, feel free to
+open an issue or a PR and I'll be glad to add them to the list.
+
+# Contributors
+
+Requests for features, PRs, suggestions ad feedback are highly appreciated.
+
+If you find you can help and want to contribute to the project with your
+experience or you do want to get part of the project for some other reason, feel
+free to contact me directly (you can find the mail in the
+[profile](https://github.com/skypjack)).<br/>
+I can't promise that each and every contribution will be accepted, but I can
+assure that I'll do my best to take them all as soon as possible.
+
+If you decide to participate, please see the guidelines for
+[contributing](CONTRIBUTING.md) before to create issues or pull
+requests.<br/>
+Take also a look at the
+[contributors list](https://github.com/skypjack/entt/blob/master/AUTHORS) to
+know who has participated so far.
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# License
+
+Code and documentation Copyright (c) 2017-2022 Michele Caini.<br/>
+Colorful logo Copyright (c) 2018-2021 Richard Caseres.
+
+Code released under
+[the MIT license](https://github.com/skypjack/entt/blob/master/LICENSE).<br/>
+Documentation released under
+[CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).<br/>
+All logos released under
+[CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/).
--- a/external/entt/entt/TODO
+++ b/external/entt/entt/TODO
@ -0,0 +1,27 @@
+* debugging tools (#60): the issue online already contains interesting tips on this, look at it
+* work stealing job system (see #100) + mt scheduler based on const awareness for types
+
+EXAMPLES
+* filter on runtime values/variables (not only types)
+* support to polymorphic types (see #859)
+
+DOC:
+* storage<void>
+* custom storage/view
+* examples (and credits) from @alanjfs :)
+* update entity doc when the storage based model is in place
+
+TODO (high prio):
+* remove the static storage from the const assure in the registry
+
+WIP:
+* get rid of observers, storage based views made them pointless - document alternatives
+* add storage getter for filters to views and groups
+* exploit the tombstone mechanism to allow enabling/disabling entities (see bump, compact and clear for further details)
+* basic_storage::bind for cross-registry setups (see and remove todo from entity_copy.cpp)
+* process scheduler: reviews, use free lists internally
+* dedicated entity storage, in-place O(1) release/destroy for non-orphaned entities, out-of-sync model
+* entity-only and exclude-only views (both solved with entity storage and storage<void>)
+* custom allocators all over (registry, ...)
+* add test for maximum number of entities reached
+* deprecate non-owning groups in favor of owning views and view packs, introduce lazy owning views
--- a/external/entt/entt/WORKSPACE
+++ b/external/entt/entt/WORKSPACE
@ -0,0 +1 @@
+workspace(name = "com_github_skypjack_entt")
--- a/external/entt/entt/build/.gitignore
+++ b/external/entt/entt/build/.gitignore
@ -0,0 +1,2 @@
+*
+!.gitignore
--- a/external/entt/entt/cmake/in/EnTTConfig.cmake.in
+++ b/external/entt/entt/cmake/in/EnTTConfig.cmake.in
@ -0,0 +1,5 @@
+@PACKAGE_INIT@
+
+set(EnTT_VERSION "@PROJECT_VERSION@")
+include("${CMAKE_CURRENT_LIST_DIR}/EnTTTargets.cmake")
+check_required_components("@PROJECT_NAME@")
--- a/external/entt/entt/cmake/in/entt.pc.in
+++ b/external/entt/entt/cmake/in/entt.pc.in
@ -0,0 +1,8 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=@EnTT_PKGCONFIG_INCLUDEDIR@
+
+Name: EnTT
+Description: Gaming meets modern C++
+Url: https://github.com/skypjack/entt
+Version: @ENTT_VERSION@
+Cflags: -I${includedir}
--- a/external/entt/entt/cmake/modules/JoinPaths.cmake
+++ b/external/entt/entt/cmake/modules/JoinPaths.cmake
@ -0,0 +1,23 @@
+# This module provides function for joining paths
+# known from most languages
+#
+# SPDX-License-Identifier: (MIT OR CC0-1.0)
+# Copyright 2020 Jan Tojnar
+# https://github.com/jtojnar/cmake-snips
+#
+# Modelled after Python<6F>s os.path.join
+# https://docs.python.org/3.7/library/os.path.html#os.path.join
+# Windows not supported
+function(join_paths joined_path first_path_segment)
+    set(temp_path "${first_path_segment}")
+    foreach(current_segment IN LISTS ARGN)
+        if(NOT ("${current_segment}" STREQUAL ""))
+            if(IS_ABSOLUTE "${current_segment}")
+                set(temp_path "${current_segment}")
+            else()
+                set(temp_path "${temp_path}/${current_segment}")
+            endif()
+        endif()
+    endforeach()
+    set(${joined_path} "${temp_path}" PARENT_SCOPE)
+endfunction()
--- a/external/entt/entt/conan/build.py
+++ b/external/entt/entt/conan/build.py
@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from cpt.packager import ConanMultiPackager
+import os
+
+if __name__ == "__main__":
+    username = os.getenv("GITHUB_ACTOR")
+    tag_version = os.getenv("GITHUB_REF")
+    tag_package = os.getenv("GITHUB_REPOSITORY")
+    login_username = os.getenv("CONAN_LOGIN_USERNAME")
+    package_version = tag_version.replace("refs/tags/v", "")
+    package_name = tag_package.replace("skypjack/", "")
+    reference = "{}/{}".format(package_name, package_version)
+    channel = os.getenv("CONAN_CHANNEL", "stable")
+    upload = os.getenv("CONAN_UPLOAD")
+    stable_branch_pattern = os.getenv("CONAN_STABLE_BRANCH_PATTERN", r"v\d+\.\d+\.\d+.*")
+    test_folder = os.getenv("CPT_TEST_FOLDER", os.path.join("conan", "test_package"))
+    upload_only_when_stable = os.getenv("CONAN_UPLOAD_ONLY_WHEN_STABLE", True)
+    disable_shared = os.getenv("CONAN_DISABLE_SHARED_BUILD", "False")
+
+    builder = ConanMultiPackager(username=username,
+                                 reference=reference,
+                                 channel=channel,
+                                 login_username=login_username,
+                                 upload=upload,
+                                 stable_branch_pattern=stable_branch_pattern,
+                                 upload_only_when_stable=upload_only_when_stable,
+                                 test_folder=test_folder)
+    builder.add()
+
+    filtered_builds = []
+    for settings, options, env_vars, build_requires, reference in builder.items:
+        if disable_shared == "False" or not options["{}:shared".format(package_name)]:
+             filtered_builds.append([settings, options, env_vars, build_requires])
+    builder.builds = filtered_builds
+
+    builder.run()
--- a/external/entt/entt/conan/ci/build.sh
+++ b/external/entt/entt/conan/ci/build.sh
@ -0,0 +1,7 @@
+#!/bin/bash
+
+set -e
+set -x
+
+conan user
+python conan/build.py
--- a/external/entt/entt/conan/ci/install.sh
+++ b/external/entt/entt/conan/ci/install.sh
@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -e
+set -x
+
+pip install -U conan_package_tools conan
--- a/external/entt/entt/conan/test_package/CMakeLists.txt
+++ b/external/entt/entt/conan/test_package/CMakeLists.txt
@ -0,0 +1,13 @@
+cmake_minimum_required(VERSION 3.7.2)
+project(test_package)
+
+set(CMAKE_VERBOSE_MAKEFILE TRUE)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+include(${CMAKE_BINARY_DIR}/conanbuildinfo.cmake)
+conan_basic_setup()
+
+add_executable(${PROJECT_NAME} test_package.cpp)
+target_link_libraries(${PROJECT_NAME} ${CONAN_LIBS})
--- a/external/entt/entt/conan/test_package/conanfile.py
+++ b/external/entt/entt/conan/test_package/conanfile.py
@ -0,0 +1,19 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from conans import ConanFile, CMake
+import os
+
+
+class TestPackageConan(ConanFile):
+    settings = "os", "compiler", "build_type", "arch"
+    generators = "cmake"
+
+    def build(self):
+        cmake = CMake(self)
+        cmake.configure()
+        cmake.build()
+
+    def test(self):
+        bin_path = os.path.join("bin", "test_package")
+        self.run(bin_path, run_environment=True)
--- a/external/entt/entt/conan/test_package/test_package.cpp
+++ b/external/entt/entt/conan/test_package/test_package.cpp
@ -0,0 +1,56 @@
+#include <entt/entt.hpp>
+#include <cstdint>
+
+struct position {
+    float x;
+    float y;
+};
+
+struct velocity {
+    float dx;
+    float dy;
+};
+
+void update(entt::registry &registry) {
+    auto view = registry.view<position, velocity>();
+
+    for(auto entity: view) {
+        // gets only the components that are going to be used ...
+
+        auto &vel = view.get<velocity>(entity);
+
+        vel.dx = 0.;
+        vel.dy = 0.;
+
+        // ...
+    }
+}
+
+void update(std::uint64_t dt, entt::registry &registry) {
+    registry.view<position, velocity>().each([dt](auto &pos, auto &vel) {
+        // gets all the components of the view at once ...
+
+        pos.x += vel.dx * dt;
+        pos.y += vel.dy * dt;
+
+        // ...
+    });
+}
+
+int main() {
+    entt::registry registry;
+    std::uint64_t dt = 16;
+
+    for(auto i = 0; i < 10; ++i) {
+        auto entity = registry.create();
+        registry.emplace<position>(entity, i * 1.f, i * 1.f);
+        if(i % 2 == 0) { registry.emplace<velocity>(entity, i * .1f, i * .1f); }
+    }
+
+    update(dt, registry);
+    update(registry);
+
+    // ...
+
+    return EXIT_SUCCESS;
+}
--- a/external/entt/entt/conanfile.py
+++ b/external/entt/entt/conanfile.py
@ -0,0 +1,27 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+from conans import ConanFile
+
+
+class EnttConan(ConanFile):
+    name = "entt"
+    description = "Gaming meets modern C++ - a fast and reliable entity-component system (ECS) and much more "
+    topics = ("conan," "entt", "gaming", "entity", "ecs")
+    url = "https://github.com/skypjack/entt"
+    homepage = url
+    author = "Michele Caini <michele.caini@gmail.com>"
+    license = "MIT"
+    exports = ["LICENSE"]
+    exports_sources = ["src/*"]
+    no_copy_source = True
+
+    def package(self):
+        self.copy(pattern="LICENSE", dst="licenses")
+        self.copy(pattern="*", dst="include", src="src", keep_path=True)
+
+    def package_info(self):
+        if not self.in_local_cache:
+            self.cpp_info.includedirs = ["src"]
+
+    def package_id(self):
+        self.info.header_only()
--- a/external/entt/entt/docs/CMakeLists.txt
+++ b/external/entt/entt/docs/CMakeLists.txt
@ -0,0 +1,40 @@
+#
+# Doxygen configuration (documentation)
+#
+
+set(DOXY_DEPS_DIRECTORY ${EnTT_SOURCE_DIR}/deps)
+set(DOXY_SOURCE_DIRECTORY ${EnTT_SOURCE_DIR}/src)
+set(DOXY_DOCS_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+set(DOXY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
+
+configure_file(doxy.in doxy.cfg @ONLY)
+
+add_custom_target(
+    docs ALL
+    COMMAND ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/doxy.cfg
+    WORKING_DIRECTORY ${EnTT_SOURCE_DIR}
+    VERBATIM
+    SOURCES
+        dox/extra.dox
+        md/config.md
+        md/container.md
+        md/core.md
+        md/entity.md
+        md/faq.md
+        md/lib.md
+        md/links.md
+        md/locator.md
+        md/meta.md
+        md/poly.md
+        md/process.md
+        md/reference.md
+        md/resource.md
+        md/signal.md
+        md/unreal.md
+        doxy.in
+)
+
+install(
+    DIRECTORY ${DOXY_OUTPUT_DIRECTORY}/html
+    DESTINATION share/${PROJECT_NAME}-${PROJECT_VERSION}/
+)
--- a/external/entt/entt/docs/dox/extra.dox
+++ b/external/entt/entt/docs/dox/extra.dox
@ -0,0 +1,5 @@
+/**
+ * @namespace entt
+ *
+ * @brief `EnTT` default namespace.
+ */
--- a/external/entt/entt/docs/doxy.in
+++ b/external/entt/entt/docs/doxy.in
--- a/external/entt/entt/docs/md/config.md
+++ b/external/entt/entt/docs/md/config.md
@ -0,0 +1,121 @@
+# Crash Course: configuration
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Definitions](#definitions)
+  * [ENTT_NOEXCEPTION](#entt_noexception)
+  * [ENTT_USE_ATOMIC](#entt_use_atomic)
+  * [ENTT_ID_TYPE](#entt_id_type)
+  * [ENTT_SPARSE_PAGE](#entt_sparse_page)
+  * [ENTT_PACKED_PAGE](#entt_packed_page)
+  * [ENTT_ASSERT](#entt_assert)
+    * [ENTT_ASSERT_CONSTEXPR](#entt_assert_constexpr)
+    * [ENTT_DISABLE_ASSERT](#entt_disable_assert)
+  * [ENTT_NO_ETO](#entt_no_eto)
+  * [ENTT_STANDARD_CPP](#entt_standard_cpp)
+
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+`EnTT` has become almost completely customizable over time, in many
+respects. These variables are just one of the many ways to customize how it
+works.<br/>
+In the vast majority of cases, users will have no interest in changing the
+default parameters. For all other cases, the list of possible configurations
+with which it's possible to adjust the behavior of the library at runtime can be
+found below.
+
+# Definitions
+
+All options are intended as parameters to the compiler (or user-defined macros
+within the compilation units, if preferred).<br/>
+Each parameter can result in internal library definitions. It's not recommended
+to try to also modify these definitions, since there is no guarantee that they
+will remain stable over time unlike the options below.
+
+## ENTT_NOEXCEPTION
+
+Define this variable without assigning any value to it to turn off exception
+handling in `EnTT`.<br/>
+This is roughly equivalent to setting the compiler flag `-fno-exceptions` but is
+also limited to this library only.
+
+## ENTT_USE_ATOMIC
+
+In general, `EnTT` doesn't offer primitives to support multi-threading. Many of
+the features can be split over multiple threads without any explicit control and
+the user is the one who knows if a synchronization point is required.<br/>
+However, some features aren't easily accessible to users and are made
+thread-safe by means of this definition.
+
+## ENTT_ID_TYPE
+
+`entt::id_type` is directly controlled by this definition and widely used within
+the library.<br/>
+By default, its type is `std::uint32_t`. However, users can define a different
+default type if necessary.
+
+## ENTT_SPARSE_PAGE
+
+It's known that the ECS module of `EnTT` is based on _sparse sets_. What is less
+known perhaps is that the sparse arrays are paged to reduce memory usage.<br/>
+Default size of pages (that is, the number of elements they contain) is 4096 but
+users can adjust it if appropriate. In all case, the chosen value **must** be a
+power of 2.
+
+## ENTT_PACKED_PAGE
+
+As it happens with sparse arrays, packed arrays are also paginated. However, in
+this case the aim isn't to reduce memory usage but to have pointer stability
+upon component creation.<br/>
+Default size of pages (that is, the number of elements they contain) is 1024 but
+users can adjust it if appropriate. In all case, the chosen value **must** be a
+power of 2.
+
+## ENTT_ASSERT
+
+For performance reasons, `EnTT` doesn't use exceptions or any other control
+structures. In fact, it offers many features that result in undefined behavior
+if not used correctly.<br/>
+To get around this, the library relies on a lot of asserts for the purpose of
+detecting errors in debug builds. By default, it uses `assert` internally. Users
+are allowed to overwrite its behavior by setting this variable.
+
+### ENTT_ASSERT_CONSTEXPR
+
+Usually, an assert within a `constexpr` function isn't a big deal. However, in
+case of extreme customizations, it might be useful to differentiate.<br/>
+For this purpose, `EnTT` introduces an admittedly badly named variable to make
+the job easier in this regard. By default, this variable forwards its arguments
+to `ENTT_ASSERT`.
+
+### ENTT_DISABLE_ASSERT
+
+Assertions may in turn affect performance to an extent when enabled. Whether
+`ENTT_ASSERT` and `ENTT_ASSERT_CONSTEXPR` are redefined or not, all asserts can
+be disabled at once by means of this definition.<br/>
+Note that `ENTT_DISABLE_ASSERT` takes precedence over the redefinition of the
+other variables and is therefore meant to disable all controls no matter what.
+
+## ENTT_NO_ETO
+
+In order to reduce memory consumption and increase performance, empty types are
+never instantiated nor stored by the ECS module of `EnTT`.<br/>
+Use this variable to treat these types like all others and therefore to create a
+dedicated storage for them.
+
+## ENTT_STANDARD_CPP
+
+`EnTT` mixes non-standard language features with others that are perfectly
+compliant to offer some of its functionalities.<br/>
+This definition prevents the library from using non-standard techniques, that
+is, functionalities that aren't fully compliant with the standard C++.<br/>
+While there are no known portability issues at the time of this writing, this
+should make the library fully portable anyway if needed.
--- a/external/entt/entt/docs/md/container.md
+++ b/external/entt/entt/docs/md/container.md
@ -0,0 +1,67 @@
+# Crash Course: containers
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Containers](#containers)
+  * [Dense map](#dense-map)
+  * [Dense set](#dense-set)
+
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+The standard C++ library offers a wide range of containers and it's really
+difficult to do better (although it's very easy to do worse, as many examples
+available online demonstrate).<br/>
+`EnTT` doesn't try in any way to replace what is offered by the standard. Quite
+the opposite, given the widespread use that is made of standard containers.<br/>
+However, the library also tries to fill a gap in features and functionality by
+making available some containers initially developed for internal use.
+
+This section of the library is likely to grow larger over time. However, for the
+moment it's quite small and mainly aimed at satisfying some internal needs.<br/>
+For all containers made available, full test coverage and stability over time is
+guaranteed as usual.
+
+# Containers
+
+## Dense map
+
+The dense map made available in `EnTT` is a hash map that aims to return a
+packed array of elements, so as to reduce the number of jumps in memory during
+iterations.<br/>
+The implementation is based on _sparse sets_ and each bucket is identified by an
+implicit list within the packed array itself.
+
+The interface is very close to its counterpart in the standard library, that is,
+`std::unordered_map`.<br/>
+However, both local and non-local iterators returned by a dense map belong to
+the input iterator category although they respectively model the concepts of a
+_forward iterator_ type and a _random access iterator_ type.<br/>
+This is because they return a pair of references rather than a reference to a
+pair. In other words, dense maps return a so called _proxy iterator_ the value
+type of which is:
+
+* `std::pair<const Key &, Type &>` for non-const iterator types.
+* `std::pair<const Key &, const Type &>` for const iterator types.
+
+This is quite different from what any standard library map returns and should be
+taken into account when looking for a drop-in replacement.
+
+## Dense set
+
+The dense set made available in `EnTT` is a hash set that aims to return a
+packed array of elements, so as to reduce the number of jumps in memory during
+iterations.<br/>
+The implementation is based on _sparse sets_ and each bucket is identified by an
+implicit list within the packed array itself.
+
+The interface is in all respects similar to its counterpart in the standard
+library, that is, `std::unordered_set`.<br/>
+Therefore, there is no need to go into the API description.
--- a/external/entt/entt/docs/md/core.md
+++ b/external/entt/entt/docs/md/core.md
--- a/external/entt/entt/docs/md/entity.md
+++ b/external/entt/entt/docs/md/entity.md
--- a/external/entt/entt/docs/md/faq.md
+++ b/external/entt/entt/docs/md/faq.md
@ -0,0 +1,215 @@
+# Frequently Asked Questions
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [FAQ](#faq)
+  * [Why is my debug build on Windows so slow?](#why-is-my-debug-build-on-windows-so-slow)
+  * [How can I represent hierarchies with my components?](#how-can-i-represent-hierarchies-with-my-components)
+  * [Custom entity identifiers: yay or nay?](#custom-entity-identifiers-yay-or-nay)
+  * [Warning C4307: integral constant overflow](#warning-C4307-integral-constant-overflow)
+  * [Warning C4003: the min, the max and the macro](#warning-C4003-the-min-the-max-and-the-macro)
+  * [The standard and the non-copyable types](#the-standard-and-the-non-copyable-types)
+  * [Which functions trigger which signals](#which-functions-trigger-which-signals)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+This is a constantly updated section where I'm trying to put the answers to the
+most frequently asked questions.<br/>
+If you don't find your answer here, there are two cases: nobody has done it yet
+or this section needs updating. In both cases, you can
+[open a new issue](https://github.com/skypjack/entt/issues/new) or enter either
+the [gitter channel](https://gitter.im/skypjack/entt) or the
+[discord server](https://discord.gg/5BjPWBd) to ask for help.<br/>
+Probably someone already has an answer for you and we can then integrate this
+part of the documentation.
+
+# FAQ
+
+## Why is my debug build on Windows so slow?
+
+`EnTT` is an experimental project that I also use to keep me up-to-date with the
+latest revision of the language and the standard library. For this reason, it's
+likely that some classes you're working with are using standard containers under
+the hood.<br/>
+Unfortunately, it's known that the standard containers aren't particularly
+performing in debugging (the reasons for this go beyond this document) and are
+even less so on Windows apparently. Fortunately this can also be mitigated a
+lot, achieving good results in many cases.
+
+First of all, there are two things to do in a Windows project:
+
+* Disable the [`/JMC`](https://docs.microsoft.com/cpp/build/reference/jmc)
+  option (_Just My Code_ debugging), available starting with Visual Studio 2017
+  version 15.8.
+
+* Set the [`_ITERATOR_DEBUG_LEVEL`](https://docs.microsoft.com/cpp/standard-library/iterator-debug-level)
+  macro to 0. This will disable checked iterators and iterator debugging.
+
+Moreover, set the `ENTT_DISABLE_ASSERT` variable or redefine the `ENTT_ASSERT`
+macro to disable internal debug checks in `EnTT`:
+
+```cpp
+#define ENTT_ASSERT(...) ((void)0)
+```
+
+These asserts are introduced to help the users but they require to access to the
+underlying containers and therefore risk ruining the performance in some cases.
+
+With these changes, debug performance should increase enough in most cases. If
+you want something more, you can also switch to an optimization level `O0` or
+preferably `O1`.
+
+## How can I represent hierarchies with my components?
+
+This is one of the first questions that anyone makes when starting to work with
+the entity-component-system architectural pattern.<br/>
+There are several approaches to the problem and the best one depends mainly on
+the real problem one is facing. In all cases, how to do it doesn't strictly
+depend on the library in use, but the latter certainly allows or not different
+techniques depending on how the data are laid out.
+
+I tried to describe some of the approaches that fit well with the model of
+`EnTT`. [This](https://skypjack.github.io/2019-06-25-ecs-baf-part-4/) is the
+first post of a series that tries to _explore_ the problem. More will probably
+come in future.<br/>
+In addition, `EnTT` also offers the possibility to create stable storage types
+and therefore have pointer stability for one, all or some components. This is by
+far the most convenient solution when it comes to creating hierarchies and
+whatnot. See the documentation for the ECS part of the library and in particular
+what concerns the `component_traits` class for further details.
+
+## Custom entity identifiers: yay or nay?
+
+Custom entity identifiers are definitely a good idea in two cases at least:
+
+* If `std::uint32_t` isn't large enough for your purposes, since this is the
+  underlying type of `entt::entity`.
+
+* If you want to avoid conflicts when using multiple registries.
+
+Identifiers can be defined through enum classes and class types that define an
+`entity_type` member of type `std::uint32_t` or `std::uint64_t`.<br/>
+In fact, this is a definition equivalent to that of `entt::entity`:
+
+```cpp
+enum class entity: std::uint32_t {};
+```
+
+There is no limit to the number of identifiers that can be defined.
+
+## Warning C4307: integral constant overflow
+
+According to [this](https://github.com/skypjack/entt/issues/121) issue, using a
+hashed string under VS (toolset v141) could generate a warning.<br/>
+First of all, I want to reassure you: it's expected and harmless. However, it
+can be annoying.
+
+To suppress it and if you don't want to suppress all the other warnings as well,
+here is a workaround in the form of a macro:
+
+```cpp
+#if defined(_MSC_VER)
+#define HS(str) __pragma(warning(suppress:4307)) entt::hashed_string{str}
+#else
+#define HS(str) entt::hashed_string{str}
+#endif
+```
+
+With an example of use included:
+
+```cpp
+constexpr auto identifier = HS("my/resource/identifier");
+```
+
+Thanks to [huwpascoe](https://github.com/huwpascoe) for the courtesy.
+
+## Warning C4003: the min, the max and the macro
+
+On Windows, a header file defines two macros `min` and `max` which may result in
+conflicts with their counterparts in the standard library and therefore in
+errors during compilation.
+
+It's a pretty big problem but fortunately it's not a problem of `EnTT` and there
+is a fairly simple solution to it.<br/>
+It consists in defining the `NOMINMAX` macro before including any other header
+so as to get rid of the extra definitions:
+
+```cpp
+#define NOMINMAX
+```
+
+Please refer to [this](https://github.com/skypjack/entt/issues/96) issue for
+more details.
+
+## The standard and the non-copyable types
+
+`EnTT` uses internally the trait `std::is_copy_constructible_v` to check if a
+component is actually copyable. However, this trait doesn't really check whether
+a type is actually copyable. Instead, it just checks that a suitable copy
+constructor and copy operator exist.<br/>
+This can lead to surprising results due to some idiosyncrasies of the standard.
+
+For example, `std::vector` defines a copy constructor that is conditionally
+enabled depending on whether the value type is copyable or not. As a result,
+`std::is_copy_constructible_v` returns true for the following specialization:
+
+```cpp
+struct type {
+    std::vector<std::unique_ptr<action>> vec;
+};
+```
+
+However, the copy constructor is effectively disabled upon specialization.
+Therefore, trying to assign an instance of this type to an entity may trigger a
+compilation error.<br/>
+As a workaround, users can mark the type explicitly as non-copyable. This also
+suppresses the implicit generation of the move constructor and operator, which
+will therefore have to be defaulted accordingly:
+
+```cpp
+struct type {
+    type(const type &) = delete;
+    type(type &&) = default;
+
+    type & operator=(const type &) = delete;
+    type & operator=(type &&) = default;
+
+    std::vector<std::unique_ptr<action>> vec;
+};
+```
+
+Note that aggregate initialization is also disabled as a consequence.<br/>
+Fortunately, this type of trick is quite rare. The bad news is that there is no
+way to deal with it at the library level, this being due to the design of the
+language. On the other hand, the fact that the language itself also offers a way
+to mitigate the problem makes it manageable.
+
+## Which functions trigger which signals
+
+The `registry` class offers three signals that are emitted following specific
+operations. Maybe not everyone knows what these operations are, though.<br/>
+If this isn't clear, below you can find a _vademecum_ for this purpose:
+
+* `on_created` is invoked when a component is first added (neither modified nor 
+  replaced) to an entity.
+
+* `on_update` is called whenever an existing component is modified or replaced.
+
+* `on_destroyed` is called when a component is explicitly or implicitly removed 
+  from an entity.
+
+Among the most controversial functions can be found `emplace_or_replace` and
+`destroy`. However, following the above rules, it's quite simple to know what 
+will happen.<br/>
+In the first case, `on_created` is invoked if the entity has not the component,
+otherwise the latter is replaced and therefore `on_update` is triggered. As for
+the second case, components are removed from their entities and thus freed when
+they are recycled. It means that `on_destroyed` is triggered for every component 
+owned by the entity that is destroyed.
--- a/external/entt/entt/docs/md/graph.md
+++ b/external/entt/entt/docs/md/graph.md
@ -0,0 +1,299 @@
+# Crash Course: graph
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Data structures](#data-structures)
+  * [Adjacency matrix](#adjacency-matrix)
+  * [Graphviz dot language](#graphviz-dot-language)
+* [Flow builder](#flow-builder)
+  * [Tasks and resources](#tasks-and-resources)
+  * [Fake resources and order of execution](#fake-resources-and-order-of-execution)
+  * [Sync points](#sync-points)
+  * [Execution graph](#execution-graph)
+
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+`EnTT` doesn't aim to offer everything one needs to work with graphs. Therefore,
+anyone looking for this in the _graph_ submodule will be disappointed.<br/>
+Quite the opposite is true. This submodule is minimal and contains only the data
+structures and algorithms strictly necessary for the development of some tools
+such as the _flow builder_.
+
+# Data structures
+
+As anticipated in the introduction, the aim isn't to offer all possible data
+structures suitable for representing and working with graphs. Many will likely
+be added or refined over time, however I want to discourage anyone expecting
+tight scheduling on the subject.<br/>
+The data structures presented in this section are mainly useful for the
+development and support of some tools which are also part of the same submodule.
+
+## Adjacency matrix
+
+The adjacency matrix is designed to represent either a directed or an undirected
+graph:
+
+```cpp
+entt::adjacency_matrix<entt::directed_tag> adjacency_matrix{};
+```
+
+The `directed_tag` type _creates_ the graph as directed. There is also an
+`undirected_tag` counterpart which creates it as undirected.<br/>
+The interface deviates slightly from the typical double indexing of C and offers
+an API that is perhaps more familiar to a C++ programmer. Therefore, the access
+and modification of an element will take place via the `contains`, `insert` and
+`erase` functions rather than a double call to an `operator[]`:
+
+```cpp
+if(adjacency_matrix.contains(0u, 1u)) {
+    adjacency_matrix.erase(0u, 1u);
+} else {
+    adjacency_matrix.insert(0u, 1u);
+}
+```
+
+Both `insert` and` erase` are idempotent functions which have no effect if the
+element already exists or has already been deleted.<br/>
+The first one returns an `std::pair` containing the iterator to the element and
+a boolean value indicating whether the element has been inserted or was already
+present. The second one instead returns the number of deleted elements (0 or 1).
+
+An adjacency matrix must be initialized with the number of elements (vertices)
+when constructing it but can also be resized later using the `resize` function:
+
+```cpp
+entt::adjacency_matrix<entt::directed_tag> adjacency_matrix{3u};
+```
+
+To visit all vertices, the class offers a function named `vertices` that returns
+an iterable object suitable for the purpose:
+
+```cpp
+for(auto &&vertex: adjacency_matrix.vertices()) {
+    // ...
+}
+```
+
+Note that the same result can be obtained with the following snippet, since the
+vertices are unsigned integral values:
+
+```cpp
+for(auto last = adjacency_matrix.size(), pos = {}; pos < last; ++pos) {
+    // ...
+}
+```
+
+As for visiting the edges, a few functions are available.<br/>
+When the purpose is to visit all the edges of a given adjacency matrix, the
+`edges` function returns an iterable object that can be used to get them as
+pairs of vertices:
+
+```cpp
+for(auto [lhs, rhs]: adjacency_matrix.edges()) {
+    // ...
+}
+```
+
+On the other hand, if the goal is to visit all the in- or out-edges of a given
+vertex, the `in_edges` and `out_edges` functions are meant for that:
+
+```cpp
+for(auto [lhs, rhs]: adjacency_matrix.out_edges(3u)) {
+    // ...
+}
+```
+
+As might be expected, these functions expect the vertex to visit (that is, to
+return the in- or out-edges for) as an argument.<br/>
+Finally, the adjacency matrix is an allocator-aware container and offers most of
+the functionality one would expect from this type of containers, such as `clear`
+or 'get_allocator` and so on.
+
+## Graphviz dot language
+
+As it's one of the most popular formats, the library offers minimal support for
+converting a graph to a Graphviz dot snippet.<br/>
+The simplest way is to pass both an output stream and a graph to the `dot`
+function:
+
+```cpp
+std::ostringstream output{};
+entt::dot(output, adjacency_matrix);
+```
+
+However, there is also the option of providing a callback to which the vertices
+are passed and which can be used to add (`dot`) properties to the output from
+time to time:
+
+```cpp
+std::ostringstream output{};
+entt::dot(output, adjacency_matrix, [](auto &output, auto vertex) {
+    out << "label=\"v\"" << vertex << ",shape=\"box\"";
+});
+```
+
+This second mode is particularly convenient when the user wants to associate
+data managed externally to the graph being converted.
+
+# Flow builder
+
+A flow builder is used to create execution graphs from tasks and resources.<br/>
+The implementation is as generic as possible and doesn't bind to any other part
+of the library.
+
+This class is designed as a sort of _state machine_ to which a specific task is
+attached for which the resources accessed in read-only or read-write mode are
+specified.<br/>
+Most of the functions in the API also return the flow builder itself, according
+to what is the common sense API when it comes to builder classes.
+
+Once all tasks have been registered and resources assigned to them, an execution
+graph in the form of an adjacency matrix is returned to the user.<br/>
+This graph contains all the tasks assigned to the flow builder in the form of
+_vertices_. The _vertex_ itself can be used as an index to get the identifier
+passed during registration.
+
+## Tasks and resources
+
+Although these terms are used extensively in the documentation, the flow builder
+has no real concept of tasks and resources.<br/>
+This class works mainly with _identifiers_, that is, values of type `id_type`.
+That is, both tasks and resources are identified by integral values.<br/>
+This allows not to couple the class itself to the rest of the library or to any
+particular data structure. On the other hand, it requires the user to keep track
+of the association between identifiers and operations or actual data.
+
+Once a flow builder has been created (which requires no constructor arguments),
+the first thing to do is to bind a task. This will indicate to the builder who
+intends to consume the resources that will be specified immediately after:
+
+```cpp
+entt::flow builder{};
+builder.bind("task_1"_hs);
+```
+
+Note that the example uses the `EnTT` hashed string to generate an identifier
+for the task.<br/>
+Indeed, the use of `id_type` as an identifier type is not by accident. In fact,
+it matches well with the internal hashed string class. Moreover, it's also the
+same type returned by the hash function of the internal RTTI system, in case the
+user wants to rely on that.<br/>
+However, being an integral value, it leaves the user full freedom to rely on his
+own tools if he deems it necessary.
+
+Once a task has been associated with the flow builder, it can be assigned
+read-only or read-write resources, as appropriate:
+
+```cpp
+builder
+    .bind("task_1"_hs)
+        .ro("resource_1"_hs)
+        .ro("resource_2"_hs)
+    .bind("task_2"_hs)
+        .rw("resource_2"_hs)
+```
+
+As mentioned, many functions return the builder itself and it's therefore easy
+to concatenate the different calls.<br/>
+Also in the case of resources, these are identified by numeric values of type
+`id_type`. As above, the choice is not entirely random. This goes well with the
+tools offered by the library while leaving room for maximum flexibility.
+
+Finally, both the `ro` and` rw` functions also offer an overload that accepts a
+pair of iterators, so that one can pass a range of resources in one go.
+
+## Fake resources and order of execution
+
+The flow builder doesn't offer the ability to specify when a task should execute
+before or after another task.<br/>
+In fact, the order of _registration_ on the resources also determines the order
+in which the tasks are processed during the generation of the execution graph.
+
+However, there is a way to force the execution order of two processes.<br/>
+Briefly, since accessing a resource in opposite modes requires sequential rather
+than parallel scheduling, it's possible to make use of fake resources to force
+the order execution:
+
+```cpp
+builder
+    .bind("task_1"_hs)
+        .ro("resource_1"_hs)
+        .rw("fake"_hs)
+    .bind("task_2"_hs)
+        .ro("resource_2"_hs)
+        .ro("fake"_hs)
+    .bind("task_3"_hs)
+        .ro("resource_2"_hs)
+        .ro("fake"_hs)
+```
+
+This snippet forces the execution of `task_2` and `task_3` **after** `task_1`.
+This is due to the fact that the latter sets a read-write requirement on a fake
+resource that the other tasks also want to access in read-only mode.<br/>
+Similarly, it's possible to force a task to run after a certain group:
+
+```cpp
+builder
+    .bind("task_1"_hs)
+        .ro("resource_1"_hs)
+        .ro("fake"_hs)
+    .bind("task_2"_hs)
+        .ro("resource_1"_hs)
+        .ro("fake"_hs)
+    .bind("task_3"_hs)
+        .ro("resource_2"_hs)
+        .rw("fake"_hs)
+```
+
+In this case, since there are a number of processes that want to read a specific
+resource, they will do so in parallel by forcing `task_3` to run after all the
+others tasks.
+
+## Sync points
+
+Sometimes it's useful to assign the role of _sync point_ to a node.<br/>
+Whether it accesses new resources or is simply a watershed, the procedure for
+assigning this role to a vertex is always the same: first it's tied to the flow
+builder, then the `sync` function is invoked:
+
+```cpp
+builder.bind("sync_point"_hs).sync();
+```
+
+The choice to assign an _identity_ to this type of nodes lies in the fact that,
+more often than not, they also perform operations on resources.<br/>
+If this isn't the case, it will still be possible to create no-op vertices to
+which empty tasks are assigned.
+
+## Execution graph
+
+Once both the resources and their consumers have been properly registered, the
+purpose of this tool is to generate an execution graph that takes into account
+all specified constraints to return the best scheduling for the vertices:
+
+```cpp
+entt::adjacency_matrix<entt::directed_tag> graph = builder.graph();
+```
+
+The search for the main vertices, that is those without in-edges, is usually the
+first thing required:
+
+```cpp
+for(auto &&vertex: graph) {
+    if(auto in_edges = graph.in_edges(vertex); in_edges.begin() == in_edges.end()) {
+        // ...
+    }
+}
+```
+
+Starting from them, using the other functions appropriately (such as `out_edges`
+to retrieve the children of a given task or `edges` to access their identifiers)
+it will be possible to instantiate an execution graph.
--- a/external/entt/entt/docs/md/lib.md
+++ b/external/entt/entt/docs/md/lib.md
@ -0,0 +1,99 @@
+# Push EnTT across boundaries
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Working across boundaries](#working-across-boundaries)
+  * [Smooth until proven otherwise](#smooth-until-proven-otherwise)
+  * [Meta context](#meta-context)
+  * [Memory management](#memory-management)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Working across boundaries
+
+`EnTT` has historically had a limit when used across boundaries on Windows in
+general and on GNU/Linux when default visibility was set to hidden. The
+limitation was mainly due to a custom utility used to assign unique, sequential
+identifiers with different types.<br/>
+Fortunately, nowadays using `EnTT` across boundaries is much easier.
+
+## Smooth until proven otherwise
+
+Many classes in `EnTT` make extensive use of type erasure for their purposes.
+This isn't a problem on itself (in fact, it's the basis of an API so convenient
+to use). However, a way is needed to recognize the objects whose type has been
+erased on the other side of a boundary.<br/>
+The `type_hash` class template is how identifiers are generated and thus made
+available to the rest of the library. In general, this class doesn't arouse much
+interest. The only exception is when a conflict between identifiers occurs
+(definitely uncommon though) or when the default solution proposed by `EnTT`
+isn't suitable for the user's purposes.<br/>
+The section dedicated to `type_info` contains all the details to get around the
+issue in a concise and elegant way. Please refer to the specific documentation.
+
+When working with linked libraries, compile definitions `ENTT_API_EXPORT` and
+`ENTT_API_IMPORT` can be used where there is a need to import or export symbols,
+so as to make everything work nicely across boundaries.<br/>
+On the other hand, everything should run smoothly when working with plugins or
+shared libraries that don't export any symbols.
+
+For anyone who needs more details, the test suite contains multiple examples
+covering the most common cases (see the `lib` directory for all details).<br/>
+It goes without saying that it's impossible to cover **all** possible cases.
+However, what is offered should hopefully serve as a basis for all of them.
+
+## Meta context
+
+The runtime reflection system deserves a special mention when it comes to using
+it across boundaries.<br/>
+Since it's linked already to a static context to which the elements are attached
+and different contexts don't relate to each other, they must be _shared_ to
+allow the use of meta types across boundaries.
+
+Fortunately, sharing a context is also trivial to do. First of all, the local
+one is acquired in the main space:
+
+```cpp
+auto handle = entt::locator<entt::meta_ctx>::handle();
+```
+
+Then, it's passed to the receiving space that sets it as its default context,
+thus discarding or storing aside the local one:
+
+```cpp
+entt::locator<entt::meta_ctx>::reset(handle);
+```
+
+From now on, both spaces refer to the same context and on it are attached all
+new meta types, no matter where they are created.<br/>
+Note that resetting the main context doesn't also propagate changes across
+boundaries. In other words, resetting a context results in the decoupling of the
+two sides and therefore a divergence in the contents.
+
+## Memory Management
+
+There is another subtle problem due to memory management that can lead to
+headaches.<br/>
+It can occur where there are pools of objects (such as components or events)
+dynamically created on demand. This is usually not a problem when working with
+linked libraries that rely on the same dynamic runtime. However, it can occur in
+the case of plugins or statically linked runtimes.
+
+As an example, imagine creating an instance of `registry` in the main executable
+and sharing it with a plugin. If the latter starts working with a component that
+is unknown to the former, a dedicated pool is created within the registry on
+first use.<br/>
+As one can guess, this pool is instantiated on a different side of the boundary
+from the `registry`. Therefore, the instance is now managing memory from
+different spaces and this can quickly lead to crashes if not properly addressed.
+
+To overcome the risk, it's recommended to use well-defined interfaces that make
+fundamental types pass through the boundaries, isolating the instances of the
+`EnTT` classes from time to time and as appropriate.<br/>
+Refer to the test suite for some examples, read the documentation available
+online about this type of issues or consult someone who has already had such
+experiences to avoid problems.
--- a/external/entt/entt/docs/md/links.md
+++ b/external/entt/entt/docs/md/links.md
@ -0,0 +1,266 @@
+# EnTT in Action
+
+`EnTT` is widely used in private and commercial applications. I cannot even
+mention most of them because of some signatures I put on some documents time
+ago. Fortunately, there are also people who took the time to implement open
+source projects based on `EnTT` and didn't hold back when it came to documenting
+them.
+
+Below an incomplete list of games, applications and articles that can be used as
+a reference. Where I put the word _apparently_ means that the use of `EnTT` is
+documented but the authors didn't make explicit announcements or contacted me
+directly.
+
+I hope this list can grow much more in the future:
+
+* Games:
+  * [Minecraft](https://minecraft.net/en-us/attribution/) by
+    [Mojang](https://mojang.com/): of course, **that** Minecraft, see the
+    open source attributions page for more details.
+  * [Minecraft Earth](https://www.minecraft.net/en-us/about-earth) by
+    [Mojang](https://mojang.com/): an augmented reality game for mobile, that
+    lets users bring Minecraft into the real world.
+  * [Ember Sword](https://embersword.com/): a modern Free-to-Play MMORPG with a
+    player-driven economy, a classless combat system, and scarce, tradable
+    cosmetic collectibles.
+  * Apparently [Diablo II: Resurrected](https://diablo2.blizzard.com/) by
+    [Blizzard](https://www.blizzard.com/): monsters, heroes, items, spells, all
+    resurrected. Thanks unknown insider.
+  * [Apparently](https://www.youtube.com/watch?v=P8xvOA3ikrQ&t=1105s)
+    [Call of Duty: Vanguard](https://www.callofduty.com/vanguard) by
+    [Sledgehammer Games](https://www.sledgehammergames.com/): I can neither
+    confirm nor deny but there is a license I know in the credits.
+  * Apparently [D&D Dark Alliance](https://darkalliance.wizards.com) by
+    [Wizards of the Coast](https://company.wizards.com): your party, their
+    funeral.
+  * [TiltedOnline](https://github.com/tiltedphoques/TiltedOnline) by
+    [Tilted Phoques](https://github.com/tiltedphoques): Skyrim and Fallout 4 mod
+    to play online.
+  * [Antkeeper](https://github.com/antkeeper/antkeeper-source): an ant colony
+    simulation [game](https://antkeeper.com/).
+  * [Openblack](https://github.com/openblack/openblack): open source
+    reimplementation of the game _Black & White_ (2001).
+  * [Land of the Rair](https://github.com/LandOfTheRair/core2): the new backend
+    of [a retro-style MUD](https://rair.land/) for the new age.
+  * [Face Smash](https://play.google.com/store/apps/details?id=com.gamee.facesmash):
+    a game to play with your face.
+  * [EnTT Pacman](https://github.com/Kerndog73/EnTT-Pacman): an example of how
+    to make Pacman with `EnTT`.
+  * [Wacman](https://github.com/carlfindahl/wacman): a pacman clone with OpenGL.
+  * [Classic Tower Defence](https://github.com/kerndog73/Classic-Tower-Defence):
+    a tiny little tower defence game featuring a homemade font.
+    [Check it out](https://indi-kernick.itch.io/classic-tower-defence).
+  * [The Machine](https://github.com/Kerndog73/The-Machine): a box pushing
+    puzzler with logic gates and other cool stuff.
+    [Check it out](https://indi-kernick.itch.io/the-machine-web-version).
+  * [EnTTPong](https://github.com/DomRe/EnttPong): a basic game made to showcase
+    different parts of `EnTT` and C++17.
+  * [Randballs](https://github.com/gale93/randballs): simple `SFML` and `EnTT`
+    playground.
+  * [EnTT Tower Defense](https://github.com/Daivuk/tddod): a data oriented tower
+    defense example.
+  * [EnTT Breakout](https://github.com/vblanco20-1/entt-breakout): simple
+    example of a breakout game, using `SDL` and `EnTT`.
+  * [Arcade puzzle game with EnTT](https://github.com/MasonRG/ArcadePuzzleGame):
+    arcade puzzle game made in C++ using the `SDL2` and `EnTT` libraries.
+  * [Snake with EnTT](https://github.com/MasonRG/SnakeGame): simple snake game
+    made in C++ with the `SDL2` and `EnTT` libraries.
+  * [Mirrors lasers and robots](https://github.com/guillaume-haerinck/imac-tower-defense):
+    a small tower defense game based on mirror orientation.
+  * [PopHead](https://github.com/SPC-Some-Polish-Coders/PopHead/): 2D, Zombie,
+    RPG game made from scratch in C++.
+  * [Robotligan](https://github.com/Trisslotten/robotligan): multiplayer
+    football game.
+  * [DungeonSlayer](https://github.com/alohaeee/DungeonSlayer): 2D game made
+    from scratch in C++.
+  * [3DGame](https://github.com/kwarkGorny/3DGame): 2.5D top-down space shooter.
+  * [Pulcher](https://github.com/AODQ/pulcher): 2D cross-platform game inspired
+    by Quake.
+  * [Destroid](https://github.com/tyrannicaltoucan/destroid): _one-bazillionth_
+    arcade game about shooting dirty rocks in space, inspired by Asteroids.
+  * [Wanderer](https://github.com/albin-johansson/wanderer): a 2D exploration
+    based indie game.
+  * [Spelunky<EFBFBD> Classic remake](https://github.com/dbeef/spelunky-psp): a truly
+    multiplatform experience with a rewrite from scratch.
+  * [CubbyTower](https://github.com/utilForever/CubbyTower): a simple tower
+    defense game using C++ with Entity Component System (ECS).
+  * [Runeterra](https://github.com/utilForever/Runeterra): Legends of Runeterra
+    simulator using C++ with some reinforcement learning.
+  * [Black Sun](https://store.steampowered.com/app/1670930/Black_Sun/): fly your
+    space ship through a large 2D open world.
+  * [PokeMaster](https://github.com/utilForever/PokeMaster): Pokemon Battle
+    simulator using C++ with some reinforcement learning.
+  * [HomeHearth](https://youtu.be/GrEWl8npL9Y): choose your hero, protect the
+    town, before it's too late.
+  * [City Builder Game](https://github.com/PhiGei2000/CityBuilderGame): a simple
+    city-building game using C++ and OpenGL.
+  * [BattleSub](https://github.com/bfeldpw/battlesub): two player 2D submarine
+    game with some fluid dynamics.
+  * [Crimson Rush](https://github.com/WilKam01/LuaCGame): a dungeon-crawler and
+    rougelike inspired game about exploring and surviving as long as possible.
+  * [Space Fight](https://github.com/cholushkin/SpaceFight): one screen
+    multi-player arcade shooter game prototype.
+  * [Confetti Party](https://github.com/hexerei/entt-confetti): C++ sample
+    application as a starting point using `EnTT` and `SDL2`.
+
+* Engines and the like:
+  * [Aether Engine](https://hadean.com/spatial-simulation/)
+    [v1.1+](https://docs.hadean.com/v1.1/Licenses/) by
+    [Hadean](https://hadean.com/): a library designed for spatially partitioning
+    agent-based simulations.
+  * [Fling Engine](https://github.com/flingengine/FlingEngine): a Vulkan game
+    engine with a focus on data oriented design.
+  * [NovusCore](https://github.com/novuscore/NovusCore): a modern take on World
+    of Warcraft emulation.
+  * [Chrysalis](https://github.com/ivanhawkes/Chrysalis): action RPG SDK for
+    CRYENGINE games.
+  * [LM-Engine](https://github.com/Lawrencemm/LM-Engine): the Vim of game
+    engines.
+  * [Edyn](https://github.com/xissburg/edyn): a real-time physics engine
+    organized as an ECS.
+  * [MushMachine](https://github.com/MadeOfJelly/MushMachine): engine...
+    vrooooommm.
+  * [Antara Gaming SDK](https://github.com/KomodoPlatform/antara-gaming-sdk):
+    the Komodo Gaming Software Development Kit.
+  * [XVP](https://ravingbots.com/xvp-expansive-vehicle-physics-for-unreal-engine/):
+    [_eXpansive Vehicle Physics_](https://github.com/raving-bots/xvp/wiki/Plugin-integration-guide)
+    plugin for Unreal Engine.
+  * [Apparently](https://teamwisp.github.io/credits/)
+    [Wisp](https://teamwisp.github.io/product/) by
+    [Team Wisp](https://teamwisp.github.io/): an advanced real-time ray tracing
+    renderer built for the demands of video game artists.
+  * [shiva](https://github.com/Milerius/shiva): modern C++ engine with
+    modularity.
+  * [ImGui/EnTT editor](https://github.com/Green-Sky/imgui_entt_entity_editor):
+    a drop-in, single-file entity editor for `EnTT` that uses `ImGui` as
+    graphical backend (with
+    [demo code](https://github.com/Green-Sky/imgui_entt_entity_editor_demo)).
+  * [SgOgl](https://github.com/stwe/SgOgl): a game engine library for OpenGL
+    developed for educational purposes.
+  * [Lumos](https://github.com/jmorton06/Lumos): game engine written in C++
+    using OpenGL and Vulkan.
+  * [Silvanus](https://github.com/hobbyistmaker/silvanus): Silvanus Fusion 360
+    Box Generator.
+  * [Lina Engine](https://github.com/inanevin/LinaEngine): an open-source,
+    modular, tiny and fast C++ game engine, aimed to develop 3D desktop games.
+  * [Spike](https://github.com/FahimFuad/Spike): a powerful game engine which
+    can run on a toaster.
+  * [Helena Framework](https://github.com/NIKEA-SOFT/HelenaFramework): a modern
+    framework in C++17 for backend development.
+  * [Unity/EnTT](https://github.com/TongTungGiang/unity-entt): tech demo of a
+    native simulation layer using `EnTT` and `Unity` as a rendering engine.
+  * [OverEngine](https://github.com/OverShifted/OverEngine): an over-engineered
+    game engine.
+  * [Electro](https://github.com/Electro-Technologies/Electro): high performance
+    3D game engine with a high emphasis on rendering.
+  * [Kawaii](https://github.com/Mathieu-Lala/Kawaii_Engine): a modern data
+    oriented game engine.
+  * [Becketron](https://github.com/Doctor-Foxling/Becketron): a game engine
+    written mostly in C++.
+  * [Spatial Engine](https://github.com/luizgabriel/Spatial.Engine): a
+    cross-platform engine created on top of google's filament rendering engine.
+  * [Kaguya](https://github.com/KaiH0717/Kaguya): D3D12 Rendering Engine.
+  * [OpenAWE](https://github.com/OpenAWE-Project/OpenAWE): open implementation
+    of the Alan Wake Engine.
+  * [Nazara Engine](https://github.com/DigitalPulseSoftware/NazaraEngine): fast,
+    cross-platform, object-oriented API to help in daily developer life.
+  * [Billy Engine](https://github.com/billy4479/BillyEngine): some kind of a 2D
+    engine based on `SDL2` and `EnTT`.
+  * [Ducktape](https://github.com/DucktapeEngine/Ducktape): an open source C++
+    2D & 3D game engine that focuses on being fast and powerful.
+
+* Articles, videos and blog posts:
+  * [Some posts](https://skypjack.github.io/tags/#entt) on my personal
+    [blog](https://skypjack.github.io/) are about `EnTT`, for those who want to
+    know **more** on this project.
+  * [Game Engine series](https://www.youtube.com/c/TheChernoProject/videos) by
+    [The Cherno](https://github.com/TheCherno) (not only about `EnTT` but also
+    on the use of an ECS in general):
+    - [Intro to EnTT](https://www.youtube.com/watch?v=D4hz0wEB978).
+    - [Entities and Components](https://www.youtube.com/watch?v=-B1iu4QJTUc).
+    - [The ENTITY Class](https://www.youtube.com/watch?v=GfSzeAcsBb0).
+    - [Camera Systems](https://www.youtube.com/watch?v=ubZn7BlrnTU).
+    - [Scene Camera](https://www.youtube.com/watch?v=UKVFRRufKzo).
+    - [Native Scripting](https://www.youtube.com/watch?v=iIUhg88MK5M).
+    - [Native Scripting (now with virtual functions!)](https://www.youtube.com/watch?v=1cHEcrIn8IQ).
+    - [Scene Hierarchy Panel](https://www.youtube.com/watch?v=wziDnE8guvI).
+    - [Properties Panel](https://www.youtube.com/watch?v=NBpB0qscF3E).
+    - [Camera Component UI](https://www.youtube.com/watch?v=RIMt_6agUiU).
+    - [Drawing Component UI](https://www.youtube.com/watch?v=u3yq8s3KuSE).
+    - [Transform Component UI](https://www.youtube.com/watch?v=8JqcXYbzPJc).
+    - [Adding/Removing Entities and Components UI](https://www.youtube.com/watch?v=PsyGmsIgp9M).
+    - [Saving and Loading Scenes](https://www.youtube.com/watch?v=IEiOP7Y-Mbc).
+    - ... And so on.
+      [Check out](https://www.youtube.com/channel/UCQ-W1KE9EYfdxhL6S4twUNw) the
+      _Game Engine Series_ by The Cherno for more videos.
+  * [Space Battle: Huge edition](http://victor.madtriangles.com/code%20experiment/2018/06/11/post-ecs-battle-huge.html):
+    huge space battle built entirely from scratch.
+  * [Space Battle](https://github.com/vblanco20-1/ECS_SpaceBattle): huge space
+    battle built on `UE4`.
+  * [Experimenting with ECS in UE4](http://victor.madtriangles.com/code%20experiment/2018/03/25/post-ue4-ecs-battle.html):
+    interesting article about `UE4` and `EnTT`.
+  * [Implementing ECS architecture in UE4](https://forums.unrealengine.com/development-discussion/c-gameplay-programming/1449913-implementing-ecs-architecture-in-ue4-giant-space-battle):
+    giant space battle.
+  * [Conan Adventures (SFML and EnTT in C++)](https://leinnan.github.io/blog/conan-adventuressfml-and-entt-in-c.html):
+    create projects in modern C++ using `SFML`, `EnTT`, `Conan` and `CMake`.
+  * [Adding EnTT ECS to Chrysalis](https://www.tauradius.com/post/adding-an-ecs-to-chrysalis/):
+    a blog entry (and its 
+    [follow-up](https://www.tauradius.com/post/chrysalis-update-2020-08-02/)) 
+    about the integration of `EnTT` into `Chrysalis`, an action RPG SDK for
+    CRYENGINE games.
+  * [Creating Minecraft in One Week with C++ and Vulkan](https://vazgriz.com/189/creating-minecraft-in-one-week-with-c-and-vulkan/):
+    a crack at recreating Minecraft in one week using a custom C++ engine and
+    Vulkan ([code included](https://github.com/vazgriz/VoxelGame)).
+  * [Ability Creator](https://www.erichildebrand.net/blog/ability-creator-project-retrospect):
+    project retrospect by [Eric Hildebrand](https://www.erichildebrand.net/).
+  * [EnTT Entity Component System Gaming Library](https://gamefromscratch.com/entt-entity-component-system-gaming-library/):
+    `EnTT` on GameFromScratch.com.
+  * [Custom C++ server for UE5](https://youtu.be/fbXZVNCOvjM) optimized for
+    MMO(RPG)s and its [follow-up](https://youtu.be/yGlZeopx2hU) episode about
+    player bots and full external ECS: a series definitely worth looking at.
+
+* Any Other Business:
+  * [ArcGIS Runtime SDKs](https://developers.arcgis.com/arcgis-runtime/) by
+    [Esri](https://www.esri.com/): they use `EnTT` for the internal ECS and the
+    cross platform C++ rendering engine. The SDKs are utilized by a lot of
+    enterprise custom apps, as well as by Esri for its own public applications
+    such as
+    [Explorer](https://play.google.com/store/apps/details?id=com.esri.explorer),
+    [Collector](https://play.google.com/store/apps/details?id=com.esri.arcgis.collector)
+    and
+    [Navigator](https://play.google.com/store/apps/details?id=com.esri.navigator).
+  * [FASTSUITE Edition 2](https://www.fastsuite.com/en_EN/fastsuite/fastsuite-edition-2.html)
+    by [Cenit](http://www.cenit.com/en_EN/about-us/overview.html): they use
+    `EnTT` to drive their simulation, that is, the communication between robot
+    controller emulator and renderer.
+  * [Ragdoll](https://ragdolldynamics.com/): real-time physics for Autodesk Maya
+    2020.
+  * [Project Lagrange](https://github.com/adobe/lagrange): a robust geometry
+    processing library by [Adobe](https://github.com/adobe).
+  * [AtomicDEX](https://github.com/KomodoPlatform/atomicDEX-Desktop): a secure
+    wallet and non-custodial decentralized exchange rolled into one application.
+  * [Apparently](https://www.linkedin.com/in/skypjack/)
+    [NIO](https://www.nio.io/): there was a collaboration to make some changes
+    to `EnTT`, at the time used for internal projects.
+  * [Apparently](https://www.linkedin.com/jobs/view/architekt-c%2B%2B-at-tieto-1219512333/)
+    [Tieto](https://www.tieto.com/): they published a job post where `EnTT` was
+    listed on their software stack.
+  * [Sequentity](https://github.com/alanjfs/sequentity): A MIDI-like
+    sequencer/tracker for C++ and `ImGui` (with `Magnum` and `EnTT`).
+  * [EnTT meets Sol2](https://github.com/skaarj1989/entt-meets-sol2): freely
+    available examples of how to combine `EnTT` and `Sol2`.
+  * [Godot meets EnTT](https://github.com/portaloffreedom/godot_entt_example/):
+    a simple example on how to use `EnTT` within
+    [`Godot`](https://godotengine.org/).
+  * [Godot and GameNetworkingSockets meet EnTT](https://github.com/portaloffreedom/godot_entt_net_example):
+    a simple example on how to use `EnTT` and
+    [`GameNetworkingSockets`](https://github.com/ValveSoftware/GameNetworkingSockets)
+    within [`Godot`](https://godotengine.org/).
+  * [MatchOneEntt](https://github.com/mhaemmerle/MatchOneEntt): port of
+    [Match One](https://github.com/sschmid/Match-One) for `Entitas-CSharp`.
+  * GitHub contains also
+    [many other examples](https://github.com/search?o=desc&q=%22skypjack%2Fentt%22&s=indexed&type=Code)
+    of use of `EnTT` from which to take inspiration if interested.
+
+If you know of other resources out there that are about `EnTT`, feel free to
+open an issue or a PR and I'll be glad to add them to this page.
--- a/external/entt/entt/docs/md/locator.md
+++ b/external/entt/entt/docs/md/locator.md
@ -0,0 +1,88 @@
+# Crash Course: service locator
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Service locator](#service-locator)
+  * [Opaque handles](#opaque-handles)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Usually, service locators are tightly bound to the services they expose and it's
+hard to define a general purpose solution.<br/>
+This tiny class tries to fill the gap and gets rid of the burden of defining a
+different specific locator for each application.
+
+# Service locator
+
+The service locator API tries to mimic that of `std::optional` and adds some
+extra functionalities on top of it such as allocator support.<br/>
+There are a couple of functions to set up a service, namely `emplace` and
+`allocate_emplace`:
+
+```cpp
+entt::locator<interface>::emplace<service>(argument);
+entt::locator<interface>::allocate_emplace<service>(allocator, argument);
+```
+
+The difference is that the latter expects an allocator as the first argument and
+uses it to allocate the service itself.<br/>
+Once a service is set up, it's retrieved using the `value` function:
+
+```cpp
+interface &service = entt::locator<interface>::value();
+```
+
+Since the service may not be set (and therefore this function may result in an
+undefined behavior), the `has_value` and `value_or` functions are also available
+to test a service locator and to get a fallback service in case there is none:
+
+```cpp
+if(entt::locator<interface>::has_value()) {
+    // ...
+}
+
+interface &service = entt::locator<interface>::value_or<fallback_impl>(argument);
+```
+
+All arguments are used only if necessary, that is, if a service doesn't already
+exist and therefore the fallback service is constructed and returned. In all
+other cases, they are discarded.<br/>
+Finally, to reset a service, use the `reset` function.
+
+## Opaque handles
+
+Sometimes it's useful to _transfer_ a copy of a service to another locator. For
+example, when working across boundaries it's common to _share_ a service with a
+dynamically loaded module.<br/>
+Options aren't much in this case. Among these is the possibility of _exporting_
+services and assigning them to a different locator.
+
+This is what the `handle` and `reset` functions are meant for.<br/>
+The former returns an opaque object useful for _exporting_ (or rather, obtaining
+a reference to) a service. The latter also accepts an optional argument to a
+handle which then allows users to reset a service by initializing it with an
+opaque handle:
+
+```cpp
+auto handle = entt::locator<interface>::handle();
+entt::locator<interface>::reset(handle);
+```
+
+It's worth noting that it's possible to get handles for uninitialized services
+and use them with other locators. Of course, all a user will get is to have an
+uninitialized service elsewhere as well.
+
+Note that exporting a service allows users to _share_ the object currently set
+in a locator. Replacing it won't replace the element even where a service has
+been configured with a handle to the previous item.<br/>
+In other words, if an audio service is replaced with a null object to silence an
+application and the original service was shared, this operation won't propagate
+to the other locators. Therefore, a module that share the ownership of the
+original audio service is still able to emit sounds.
--- a/external/entt/entt/docs/md/meta.md
+++ b/external/entt/entt/docs/md/meta.md
--- a/external/entt/entt/docs/md/poly.md
+++ b/external/entt/entt/docs/md/poly.md
@ -0,0 +1,359 @@
+# Crash Course: poly
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+  * [Other libraries](#other-libraries)
+* [Concept and implementation](#concept-and-implementation)
+  * [Deduced interface](#deduced-interface)
+  * [Defined interface](#defined-interface)
+  * [Fulfill a concept](#fulfill-a-concept)
+* [Inheritance](#inheritance)
+* [Static polymorphism in the wild](#static-polymorphism-in-the-wild)
+* [Storage size and alignment requirement](#storage-size-and-alignment-requirement)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Static polymorphism is a very powerful tool in C++, albeit sometimes cumbersome
+to obtain.<br/>
+This module aims to make it simple and easy to use.
+
+The library allows to define _concepts_ as interfaces to fulfill with concrete
+classes without having to inherit from a common base.<br/>
+This is, among others, one of the advantages of static polymorphism in general
+and of a generic wrapper like that offered by the `poly` class template in
+particular.<br/>
+What users get is an object that can be passed around as such and not through a
+reference or a pointer, as happens when it comes to working with dynamic
+polymorphism.
+
+Since the `poly` class template makes use of `entt::any` internally, it also
+supports most of its feature. Among the most important, the possibility to
+create aliases to existing and thus unmanaged objects. This allows users to
+exploit the static polymorphism while maintaining ownership of objects.<br/>
+Likewise, the `poly` class template also benefits from the small buffer
+optimization offered by the `entt::any` class and therefore minimizes the number
+of allocations, avoiding them altogether where possible.
+
+## Other libraries
+
+There are some very interesting libraries regarding static polymorphism.<br/>
+Among all, the two that I prefer are:
+
+* [`dyno`](https://github.com/ldionne/dyno): runtime polymorphism done right.
+* [`Poly`](https://github.com/facebook/folly/blob/master/folly/docs/Poly.md):
+  a class template that makes it easy to define a type-erasing polymorphic
+  object wrapper.
+
+The former is admittedly an experimental library, with many interesting ideas.
+I've some doubts about the usefulness of some feature in real world projects,
+but perhaps my lack of experience comes into play here. In my opinion, its only
+flaw is the API which I find slightly more cumbersome than other solutions.<br/>
+The latter was undoubtedly a source of inspiration for this module, although I
+opted for different choices in the implementation of both the final API and some
+feature.
+
+Either way, the authors are gurus of the C++ community, people I only have to
+learn from.
+
+# Concept and implementation
+
+The first thing to do to create a _type-erasing polymorphic object wrapper_ (to
+use the terminology introduced by Eric Niebler) is to define a _concept_ that
+types will have to adhere to.<br/>
+For this purpose, the library offers a single class that supports both deduced
+and fully defined interfaces. Although having interfaces deduced automatically
+is convenient and allows users to write less code in most cases, this has some
+limitations and it's therefore useful to be able to get around the deduction by
+providing a custom definition for the static virtual table.
+
+Once the interface is defined, it will be sufficient to provide a generic
+implementation to fulfill the concept.<br/>
+Also in this case, the library allows customizations based on types or families
+of types, so as to be able to go beyond the generic case where necessary.
+
+## Deduced interface
+
+This is how a concept with a deduced interface is introduced:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    template<typename Base>
+    struct type: Base {
+        void draw() { this->template invoke<0>(*this); }
+    };
+
+    // ...
+};
+```
+
+It's recognizable by the fact that it inherits from an empty type list.<br/>
+Functions can also be const, accept any number of parameters and return a type
+other than `void`:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    template<typename Base>
+    struct type: Base {
+        bool draw(int pt) const { return this->template invoke<0>(*this, pt); }
+    };
+
+    // ...
+};
+```
+
+In this case, all parameters must be passed to `invoke` after the reference to
+`this` and the return value is whatever the internal call returns.<br/>
+As for `invoke`, this is a name that is injected into the _concept_ through
+`Base`, from which one must necessarily inherit. Since it's also a dependent
+name, the `this-> template` form is unfortunately necessary due to the rules of
+the language. However, there exists also an alternative that goes through an
+external call:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    template<typename Base>
+    struct type: Base {
+        void draw() const { entt::poly_call<0>(*this); }
+    };
+
+    // ...
+};
+```
+
+Once the _concept_ is defined, users must provide a generic implementation of it
+in order to tell the system how any type can satisfy its requirements. This is
+done via an alias template within the concept itself.<br/>
+The index passed as a template parameter to either `invoke` or `poly_call`
+refers to how this alias is defined.
+
+## Defined interface
+
+A fully defined concept is no different to one for which the interface is
+deduced, with the only difference that the list of types is not empty this time:
+
+```cpp
+struct Drawable: entt::type_list<void()> {
+    template<typename Base>
+    struct type: Base {
+        void draw() { entt::poly_call<0>(*this); }
+    };
+
+    // ...
+};
+```
+
+Again, parameters and return values other than `void` are allowed. Also, the
+function type must be const when the method to bind to it is const:
+
+```cpp
+struct Drawable: entt::type_list<bool(int) const> {
+    template<typename Base>
+    struct type: Base {
+        bool draw(int pt) const { return entt::poly_call<0>(*this, pt); }
+    };
+
+    // ...
+};
+```
+
+Why should a user fully define a concept if the function types are the same as
+the deduced ones?<br>
+Because, in fact, this is exactly the limitation that can be worked around by
+manually defining the static virtual table.
+
+When things are deduced, there is an implicit constraint.<br/>
+If the concept exposes a member function called `draw` with function type
+`void()`, a concept can be satisfied:
+
+* Either by a class that exposes a member function with the same name and the
+  same signature.
+
+* Or through a lambda that makes use of existing member functions from the
+  interface itself.
+
+In other words, it's not possible to make use of functions not belonging to the
+interface, even if they are present in the types that fulfill the concept.<br/>
+Similarly, it's not possible to deduce a function in the static virtual table
+with a function type different from that of the associated member function in
+the interface itself.
+
+Explicitly defining a static virtual table suppresses the deduction step and
+allows maximum flexibility when providing the implementation for a concept.
+
+## Fulfill a concept
+
+The `impl` alias template of a concept is used to define how it's fulfilled:
+
+```cpp
+struct Drawable: entt::type_list<> {
+    // ...
+
+    template<typename Type>
+    using impl = entt::value_list<&Type::draw>;
+};
+```
+
+In this case, it's stated that the `draw` method of a generic type will be
+enough to satisfy the requirements of the `Drawable` concept.<br/>
+Both member functions and free functions are supported to fulfill concepts:
+
+```cpp
+template<typename Type>
+void print(Type &self) { self.print(); }
+
+struct Drawable: entt::type_list<void()> {
+    // ...
+
+    template<typename Type>
+    using impl = entt::value_list<&print<Type>>;
+};
+```
+
+Likewise, as long as the parameter types and return type support conversions to
+and from those of the function type referenced in the static virtual table, the
+actual implementation may differ in its function type since it's erased
+internally.<br/>
+Moreover, the `self` parameter isn't strictly required by the system and can be
+left out for free functions if not required.
+
+Refer to the inline documentation for more details.
+
+# Inheritance
+
+_Concept inheritance_ is straightforward due to how poly looks like in `EnTT`.
+Therefore, it's quite easy to build hierarchies of concepts if necessary.<br/>
+The only constraint is that all concepts in a hierarchy must belong to the same
+_family_, that is, they must be either all deduced or all defined.
+
+For a deduced concept, inheritance is achieved in a few steps:
+
+```cpp
+struct DrawableAndErasable: entt::type_list<> {
+    template<typename Base>
+    struct type: typename Drawable::template type<Base> {
+        static constexpr auto base = std::tuple_size_v<typename entt::poly_vtable<Drawable>::type>;
+        void erase() { entt::poly_call<base + 0>(*this); }
+    };
+
+    template<typename Type>
+    using impl = entt::value_list_cat_t<
+        typename Drawable::impl<Type>,
+        entt::value_list<&Type::erase>
+    >;
+};
+```
+
+The static virtual table is empty and must remain so.<br/>
+On the other hand, `type` no longer inherits from `Base` and instead forwards
+its template parameter to the type exposed by the _base class_. Internally, the
+size of the static virtual table of the base class is used as an offset for the
+local indexes.<br/>
+Finally, by means of the `value_list_cat_t` utility, the implementation consists
+in appending the new functions to the previous list.
+
+As for a defined concept instead, also the list of types must be extended, in a
+similar way to what is shown for the implementation of the above concept.<br/>
+To do this, it's useful to declare a function that allows to convert a _concept_
+into its underlying `type_list` object:
+
+```cpp
+template<typename... Type>
+entt::type_list<Type...> as_type_list(const entt::type_list<Type...> &);
+```
+
+The definition isn't strictly required, since the function will only be used
+through a `decltype` as it follows:
+
+```cpp
+struct DrawableAndErasable: entt::type_list_cat_t<
+    decltype(as_type_list(std::declval<Drawable>())),
+    entt::type_list<void()>
+> {
+    // ...
+};
+```
+
+Similar to above, `type_list_cat_t` is used to concatenate the underlying static
+virtual table with the new function types.<br/>
+Everything else is the same as already shown instead.
+
+# Static polymorphism in the wild
+
+Once the _concept_ and implementation have been introduced, it will be possible
+to use the `poly` class template to contain instances that meet the
+requirements:
+
+```cpp
+using drawable = entt::poly<Drawable>;
+
+struct circle {
+    void draw() { /* ... */ }
+};
+
+struct square {
+    void draw() { /* ... */ }
+};
+
+// ...
+
+drawable instance{circle{}};
+instance->draw();
+
+instance = square{};
+instance->draw();
+```
+
+The `poly` class template offers a wide range of constructors, from the default
+one (which will return an uninitialized `poly` object) to the copy and move
+constructors, as well as the ability to create objects in-place.<br/>
+Among others, there is also a constructor that allows users to wrap unmanaged
+objects in a `poly` instance (either const or non-const ones):
+
+```cpp
+circle shape;
+drawable instance{std::in_place_type<circle &>, shape};
+```
+
+Similarly, it's possible to create non-owning copies of `poly` from an existing
+object:
+
+```cpp
+drawable other = instance.as_ref();
+```
+
+In both cases, although the interface of the `poly` object doesn't change, it
+won't construct any element or take care of destroying the referenced objects.
+
+Note also how the underlying concept is accessed via a call to `operator->` and
+not directly as `instance.draw()`.<br/>
+This allows users to decouple the API of the wrapper from that of the concept.
+Therefore, where `instance.data()` will invoke the `data` member function of the
+poly object, `instance->data()` will map directly to the functionality exposed
+by the underlying concept.
+
+# Storage size and alignment requirement
+
+Under the hood, the `poly` class template makes use of `entt::any`. Therefore,
+it can take advantage of the possibility of defining at compile-time the size of
+the storage suitable for the small buffer optimization as well as the alignment
+requirements:
+
+```cpp
+entt::basic_poly<Drawable, sizeof(double[4]), alignof(double[4])>
+```
+
+The default size is `sizeof(double[2])`, which seems like a good compromise
+between a buffer that is too large and one unable to hold anything larger than
+an integer. The alignment requirement is optional instead and by default such
+that it's the most stringent (the largest) for any object whose size is at most
+equal to the one provided.<br/>
+It's worth noting that providing a size of 0 (which is an accepted value in all
+respects) will force the system to dynamically allocate the contained objects in
+all cases.
--- a/external/entt/entt/docs/md/process.md
+++ b/external/entt/entt/docs/md/process.md
@ -0,0 +1,212 @@
+# Crash Course: cooperative scheduler
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [The process](#the-process)
+  * [Adaptor](#adaptor)
+* [The scheduler](#the-scheduler)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Sometimes processes are a useful tool to work around the strict definition of a
+system and introduce logic in a different way, usually without resorting to the
+introduction of other components.
+
+`EnTT` offers a minimal support to this paradigm by introducing a few classes
+that users can use to define and execute cooperative processes.
+
+# The process
+
+A typical process must inherit from the `process` class template that stays true
+to the CRTP idiom. Moreover, derived classes must specify what's the intended
+type for elapsed times.
+
+A process should expose publicly the following member functions whether needed
+(note that it isn't required to define a function unless the derived class wants
+to _override_ the default behavior):
+
+* `void update(Delta, void *);`
+
+  It's invoked once per tick until a process is explicitly aborted or it
+  terminates either with or without errors. Even though it's not mandatory to
+  declare this member function, as a rule of thumb each process should at
+  least define it to work properly. The `void *` parameter is an opaque pointer
+  to user data (if any) forwarded directly to the process during an update.
+
+* `void init();`
+
+  It's invoked when the process joins the running queue of a scheduler. This
+  happens as soon as it's attached to the scheduler if the process is a top
+  level one, otherwise when it replaces its parent if the process is a
+  continuation.
+
+* `void succeeded();`
+
+  It's invoked in case of success, immediately after an update and during the
+  same tick.
+
+* `void failed();`
+
+  It's invoked in case of errors, immediately after an update and during the
+  same tick.
+
+* `void aborted();`
+
+  It's invoked only if a process is explicitly aborted. There is no guarantee
+  that it executes in the same tick, this depends solely on whether the
+  process is aborted immediately or not.
+
+Derived classes can also change the internal state of a process by invoking
+`succeed` and `fail`, as well as `pause` and `unpause` the process itself. All
+these are protected member functions made available to be able to manage the
+life cycle of a process from a derived class.
+
+Here is a minimal example for the sake of curiosity:
+
+```cpp
+struct my_process: entt::process<my_process, std::uint32_t> {
+    using delta_type = std::uint32_t;
+
+    my_process(delta_type delay)
+        : remaining{delay}
+    {}
+
+    void update(delta_type delta, void *) {
+        remaining -= std::min(remaining, delta);
+
+        // ...
+
+        if(!remaining) {
+            succeed();
+        }
+    }
+
+private:
+    delta_type remaining;
+};
+```
+
+## Adaptor
+
+Lambdas and functors can't be used directly with a scheduler for they are not
+properly defined processes with managed life cycles.<br/>
+This class helps in filling the gap and turning lambdas and functors into
+full-featured processes usable by a scheduler.
+
+The function call operator has a signature similar to the one of the `update`
+function of a process but for the fact that it receives two extra arguments to
+call whenever a process is terminated with success or with an error:
+
+```cpp
+void(Delta delta, void *data, auto succeed, auto fail);
+```
+
+Parameters have the following meaning:
+
+* `delta` is the elapsed time.
+* `data` is an opaque pointer to user data if any, `nullptr` otherwise.
+* `succeed` is a function to call when a process terminates with success.
+* `fail` is a function to call when a process terminates with errors.
+
+Both `succeed` and `fail` accept no parameters at all.
+
+Note that usually users shouldn't worry about creating adaptors at all. A
+scheduler creates them internally each and every time a lambda or a functor is
+used as a process.
+
+# The scheduler
+
+A cooperative scheduler runs different processes and helps managing their life
+cycles.
+
+Each process is invoked once per tick. If it terminates, it's removed
+automatically from the scheduler and it's never invoked again. Otherwise it's
+a good candidate to run one more time the next tick.<br/>
+A process can also have a child. In this case, the parent process is replaced
+with its child when it terminates and only if it returns with success. In case
+of errors, both the parent process and its child are discarded. This way, it's
+easy to create chain of processes to run sequentially.
+
+Using a scheduler is straightforward. To create it, users must provide only the
+type for the elapsed times and no arguments at all:
+
+```cpp
+entt::scheduler<std::uint32_t> scheduler;
+```
+
+It has member functions to query its internal data structures, like `empty` or
+`size`, as well as a `clear` utility to reset it to a clean state:
+
+```cpp
+// checks if there are processes still running
+const auto empty = scheduler.empty();
+
+// gets the number of processes still running
+entt::scheduler<std::uint32_t>::size_type size = scheduler.size();
+
+// resets the scheduler to its initial state and discards all the processes
+scheduler.clear();
+```
+
+To attach a process to a scheduler there are mainly two ways:
+
+* If the process inherits from the `process` class template, it's enough to
+  indicate its type and submit all the parameters required to construct it to
+  the `attach` member function:
+
+  ```cpp
+  scheduler.attach<my_process>(1000u);
+  ```
+
+* Otherwise, in case of a lambda or a functor, it's enough to provide an
+  instance of the class to the `attach` member function:
+
+  ```cpp
+  scheduler.attach([](auto...){ /* ... */ });
+  ```
+
+In both cases, the return value is an opaque object that offers a `then` member
+function to use to create chains of processes to run sequentially.<br/>
+As a minimal example of use:
+
+```cpp
+// schedules a task in the form of a lambda function
+scheduler.attach([](auto delta, void *, auto succeed, auto fail) {
+    // ...
+})
+// appends a child in the form of another lambda function
+.then([](auto delta, void *, auto succeed, auto fail) {
+    // ...
+})
+// appends a child in the form of a process class
+.then<my_process>(1000u);
+```
+
+To update a scheduler and therefore all its processes, the `update` member
+function is the way to go:
+
+```cpp
+// updates all the processes, no user data are provided
+scheduler.update(delta);
+
+// updates all the processes and provides them with custom data
+scheduler.update(delta, &data);
+```
+
+In addition to these functions, the scheduler offers an `abort` member function
+that can be used to discard all the running processes at once:
+
+```cpp
+// aborts all the processes abruptly ...
+scheduler.abort(true);
+
+// ... or gracefully during the next tick
+scheduler.abort();
+```
--- a/external/entt/entt/docs/md/reference.md
+++ b/external/entt/entt/docs/md/reference.md
@ -0,0 +1,75 @@
+# Similar projects
+
+There are many projects similar to `EnTT`, both open source and not.<br/>
+Some even borrowed some ideas from this library and expressed them in different
+languages.<br/>
+Others developed different architectures from scratch and therefore offer
+alternative solutions with their pros and cons.
+
+Below an incomplete list of those that I've come across so far.<br/>
+If some terms or designs aren't clear, I recommend referring to the
+[_ECS Back and Forth_](https://skypjack.github.io/tags/#ecs) series for all the
+details.
+
+I hope this list can grow much more in the future:
+
+* C:
+  * [destral_ecs](https://github.com/roig/destral_ecs): a single-file ECS based
+    on sparse sets.
+  * [Diana](https://github.com/discoloda/Diana): an ECS that uses sparse sets to
+    keep track of entities in systems.
+  * [Flecs](https://github.com/SanderMertens/flecs): a multithreaded archetype
+    ECS based on semi-contiguous arrays rather than chunks.
+  * [lent](https://github.com/nem0/lent): the Donald Trump of the ECS libraries.
+
+* C++:
+  * [decs](https://github.com/vblanco20-1/decs): a chunk based archetype ECS.
+  * [ecst](https://github.com/SuperV1234/ecst): a multithreaded compile-time
+    ECS that uses sparse sets to keep track of entities in systems.
+  * [EntityX](https://github.com/alecthomas/entityx): a bitset based ECS that
+    uses a single large matrix of components indexed with entities.
+  * [Gaia-ECS](https://github.com/richardbiely/gaia-ecs): a chunk based
+    archetype ECS.
+  * [Polypropylene](https://github.com/pmbittner/Polypropylene): a hybrid
+    solution between an ECS and dynamic mixins.
+
+* C#
+  * [Entitas](https://github.com/sschmid/Entitas-CSharp): the ECS framework for
+    C# and Unity, where _reactive systems_ were invented.
+  * [LeoECS](https://github.com/Leopotam/ecs): simple lightweight C# Entity
+    Component System framework.
+  * [Svelto.ECS](https://github.com/sebas77/Svelto.ECS): a very interesting
+    platform agnostic and table based ECS framework.
+
+* Go:
+  * [gecs](https://github.com/tutumagi/gecs): a sparse sets based ECS inspired 
+    by `EnTT`.
+
+* Javascript:
+  * [\@javelin/ecs](https://github.com/3mcd/javelin/tree/master/packages/ecs):
+    an archetype ECS in TypeScript.
+  * [ecsy](https://github.com/MozillaReality/ecsy): I haven't had the time to
+    investigate the underlying design of `ecsy` but it looks cool anyway.
+
+* Perl:
+  * [Game::Entities](https://gitlab.com/jjatria/perl-game-entities): a simple
+    entity registry for ECS designs inspired by `EnTT`.
+
+* Raku:
+  * [Game::Entities](https://gitlab.com/jjatria/raku-game-entities): a simple
+    entity registry for ECS designs inspired by `EnTT`.
+
+* Rust:
+  * [Legion](https://github.com/TomGillen/legion): a chunk based archetype ECS.
+  * [Shipyard](https://github.com/leudz/shipyard): it borrows some ideas from
+    `EnTT` and offers a sparse sets based ECS with grouping functionalities.
+  * [Sparsey](https://github.com/LechintanTudor/sparsey): sparse set based ECS
+    written in Rust.
+  * [Specs](https://github.com/amethyst/specs): a parallel ECS based mainly on
+    hierarchical bitsets that allows different types of storage as needed.
+
+* Zig
+  * [zig-ecs](https://github.com/prime31/zig-ecs): a _zig-ification_ of `EnTT`.
+
+If you know of other resources out there that can be of interest for the reader,
+feel free to open an issue or a PR and I'll be glad to add them to this page.
--- a/external/entt/entt/docs/md/resource.md
+++ b/external/entt/entt/docs/md/resource.md
@ -0,0 +1,191 @@
+# Crash Course: resource management
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [The resource, the loader and the cache](#the-resource-the-loader-and-the-cache)
+  * [Resource handle](#resource-handle)
+  * [Loaders](#loader)
+  * [The cache class](#the-cache)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Resource management is usually one of the most critical parts of a game.
+Solutions are often tuned to the particular application. There exist several
+approaches and all of them are perfectly fine as long as they fit the
+requirements of the piece of software in which they are used.<br/>
+Examples are loading everything on start, loading on request, predictive
+loading, and so on.
+
+`EnTT` doesn't pretend to offer a _one-fits-all_ solution for the different
+cases.<br/>
+Instead, the library comes with a minimal, general purpose resource cache that
+might be useful in many cases.
+
+# The resource, the loader and the cache
+
+Resource, loader and cache are the three main actors for the purpose.<br/>
+The _resource_ is an image, an audio, a video or any other type:
+
+```cpp
+struct my_resource { const int value; };
+```
+
+The _loader_ is a callable type the aim of which is to load a specific resource:
+
+```cpp
+struct my_loader final {
+    using result_type = std::shared_ptr<my_resource>;
+
+    result_type operator()(int value) const {
+        // ...
+        return std::make_shared<my_resource>(value);
+    }
+};
+```
+
+Its function operator can accept any arguments and should return a value of the
+declared result type (`std::shared_ptr<my_resource>` in the example).<br/>
+A loader can also overload its function call operator to make it possible to
+construct the same or another resource from different lists of arguments.
+
+Finally, a cache is a specialization of a class template tailored to a specific
+resource and (optionally) a loader:
+
+```cpp
+using my_cache = entt::resource_cache<my_resource, my_loader>;
+
+// ...
+
+my_cache cache{};
+```
+
+The class is designed to create different caches for different resource types
+and to manage each one independently in the most appropriate way.<br/>
+As a (very) trivial example, audio tracks can survive in most of the scenes of
+an application while meshes can be associated with a single scene only, then
+discarded when a player leaves it.
+
+## Resource handle
+
+Resources aren't returned directly to the caller. Instead, they are wrapped in a
+_resource handle_, an instance of the `entt::resource` class template.<br/>
+For those who know the _flyweight design pattern_ already, that's exactly what
+it is. To all others, this is the time to brush up on some notions instead.
+
+A shared pointer could have been used as a resource handle. In fact, the default
+implementation mostly maps the interface of its standard counterpart and only
+adds a few things on top of it.<br/>
+However, the handle in `EnTT` is designed as a standalone class template. This
+is due to the fact that specializing a class in the standard library is often
+undefined behavior while having the ability to specialize the handle for one,
+more or all resource types could help over time.
+
+## Loaders
+
+A loader is responsible for _loading_ resources (quite obviously).<br/>
+By default, it's just a callable object that forwards its arguments to the
+resource itself. That is, a _passthrough type_. All the work is demanded to the
+constructor(s) of the resource itself.<br/>
+Loaders also are fully customizable as expected.
+
+A custom loader is a class with at least one function call operator and a member
+type named `result_type`.<br/>
+The loader isn't required to return a resource handle. As long as `return_type`
+is suitable for constructing a handle, that's fine.
+
+When using the default handle, it expects a resource type which is convertible
+to or suitable for constructing an `std::shared_ptr<Type>` (where `Type` is the
+actual resource type).<br/>
+In other terms, the loader should return shared pointers to the given resource
+type. However, this isn't mandatory. Users can easily get around this constraint
+by specializing both the handle and the loader.
+
+A cache forwards all its arguments to the loader if required. This means that
+loaders can also support tag dispatching to offer different loading policies:
+
+```cpp
+struct my_loader {
+    using result_type = std::shared_ptr<my_resource>;
+
+    struct from_disk_tag{};
+    struct from_network_tag{};
+
+    template<typename Args>
+    result_type operator()(from_disk_tag, Args&&... args) {
+        // ...
+        return std::make_shared<my_resource>(std::forward<Args>(args)...);
+    }
+
+    template<typename Args>
+    result_type operator()(from_network_tag, Args&&... args) {
+        // ...
+        return std::make_shared<my_resource>(std::forward<Args>(args)...);
+    }
+}
+```
+
+This makes the whole loading logic quite flexible and easy to extend over time.
+
+## The cache class
+
+The cache is the class that is asked to _connect the dots_.<br/>
+It loads the resources, stores them aside and returns handles as needed:
+
+```cpp
+entt::resource_cache<my_resource, my_loader> cache{};
+```
+
+Under the hood, a cache is nothing more than a map where the key value has type
+`entt::id_type` while the mapped value is whatever type its loader returns.<br/>
+For this reason, it offers most of the functionalities a user would expect from
+a map, such as `empty` or `size` and so on. Similarly, it's an iterable type
+that also supports indexing by resource id:
+
+```cpp
+for(auto [id, res]: cache) {
+    // ...
+}
+
+if(entt::resource<my_resource> res = cache["resource/id"_hs]; res) {
+    // ...
+}
+```
+
+Please, refer to the inline documentation for all the details about the other
+functions (such as `contains` or `erase`).
+
+Set aside the part of the API that this class _shares_ with a map, it also adds
+something on top of it in order to address the most common requirements of a
+resource cache.<br/>
+In particular, it doesn't have an `emplace` member function which is replaced by
+`load` and `force_load` instead (where the former loads a new resource only if
+not present while the second triggers a forced loading in any case):
+
+```cpp
+auto ret = cache.load("resource/id"_hs);
+
+// true only if the resource was not already present
+const bool loaded = ret.second;
+
+// takes the resource handle pointed to by the returned iterator
+entt::resource<my_resource> res = ret.first->second;
+```
+
+Note that the hashed string is used for convenience in the example above.<br/>
+Resource identifiers are nothing more than integral values. Therefore, plain
+numbers as well as non-class enum value are accepted.
+
+It's worth mentioning that the iterators of a cache as well as its indexing
+operators return resource handles rather than instances of the mapped type.<br/>
+Since the cache has no control over the loader and a resource isn't required to
+also be convertible to bool, these handles can be invalid. This usually means an
+error in the user logic but it may also be an _expected_ event.<br/>
+It's therefore recommended to verify handles validity with a check in debug (for
+example, when loading) or an appropriate logic in retail.
--- a/external/entt/entt/docs/md/signal.md
+++ b/external/entt/entt/docs/md/signal.md
@ -0,0 +1,549 @@
+# Crash Course: events, signals and everything in between
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Introduction](#introduction)
+* [Delegate](#delegate)
+  * [Runtime arguments](#runtime-arguments)
+  * [Lambda support](#lambda-support)
+* [Signals](#signals)
+* [Event dispatcher](#event-dispatcher)
+  * [Named queues](#named-queues)
+* [Event emitter](#event-emitter)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+# Introduction
+
+Signals are more often than not a core part of games and software architectures
+in general.<br/>
+They help to decouple the various parts of a system while allowing them to
+communicate with each other somehow.
+
+The so called _modern C++_ comes with a tool that can be useful in this regard,
+the `std::function`. As an example, it can be used to create delegates.<br/>
+However, there is no guarantee that an `std::function` doesn't perform
+allocations under the hood and this could be problematic sometimes. Furthermore,
+it solves a problem but may not adapt well to other requirements that may arise
+from time to time.
+
+In case that the flexibility and power of an `std::function` isn't required or
+if the price to pay for them is too high, `EnTT` offers a complete set of
+lightweight classes to solve the same and many other problems.
+
+# Delegate
+
+A delegate can be used as a general purpose invoker with no memory overhead for
+free functions and member functions provided along with an instance on which to
+invoke them.<br/>
+It doesn't claim to be a drop-in replacement for an `std::function`, so don't
+expect to use it whenever an `std::function` fits well. That said, it's most
+likely even a better fit than an `std::function` in a lot of cases, so expect to
+use it quite a lot anyway.
+
+The interface is trivial. It offers a default constructor to create empty
+delegates:
+
+```cpp
+entt::delegate<int(int)> delegate{};
+```
+
+What is needed to create an instance is to specify the type of the function the
+delegate _accepts_, that is the signature of the functions it models.<br/>
+However, attempting to use an empty delegate by invoking its function call
+operator results in undefined behavior or most likely a crash.
+
+There exist a few overloads of the `connect` member function to initialize a
+delegate:
+
+```cpp
+int f(int i) { return i; }
+
+struct my_struct {
+    int f(const int &i) const { return i; }
+};
+
+// bind a free function to the delegate
+delegate.connect<&f>();
+
+// bind a member function to the delegate
+my_struct instance;
+delegate.connect<&my_struct::f>(instance);
+```
+
+The delegate class also accepts data members, if needed. In this case, the
+function type of the delegate is such that the parameter list is empty and the
+value of the data member is at least convertible to the return type.
+
+Free functions having type equivalent to `void(T &, args...)` are accepted as
+well. The first argument `T &` is considered a payload and the function will
+receive it back every time it's invoked. In other terms, this works just fine
+with the above definition:
+
+```cpp
+void g(const char &c, int i) { /* ... */ }
+const char c = 'c';
+
+delegate.connect<&g>(c);
+delegate(42);
+```
+
+The function `g` is invoked with a reference to `c` and `42`. However, the
+function type of the delegate is still `void(int)`. This is also the signature
+of its function call operator.<br/>
+Another interesting aspect of the delegate class is that it accepts functions
+with a list of parameters that is shorter than that of its function type:
+
+```cpp
+void g() { /* ... */ }
+delegate.connect<&g>();
+delegate(42);
+```
+
+Where the function type of the delegate is `void(int)` as above. It goes without
+saying that the extra arguments are silently discarded internally.<br/>
+This is a nice-to-have feature in a lot of cases, as an example when the
+`delegate` class is used as a building block of a signal-slot system.
+
+To create and initialize a delegate at once, there are a few specialized
+constructors. Because of the rules of the language, the listener is provided by
+means of the `entt::connect_arg` variable template:
+
+```cpp
+entt::delegate<int(int)> func{entt::connect_arg<&f>};
+```
+
+Aside `connect`, a `disconnect` counterpart isn't provided. Instead, there
+exists a `reset` member function to use to clear a delegate.<br/>
+To know if a delegate is empty, it can be used explicitly in every conditional
+statement:
+
+```cpp
+if(delegate) {
+    // ...
+}
+```
+
+Finally, to invoke a delegate, the function call operator is the way to go as
+already shown in the examples above:
+
+```cpp
+auto ret = delegate(42);
+```
+
+In all cases, listeners don't have to strictly follow the signature of the
+delegate. As long as a listener can be invoked with the given arguments to yield
+a result that is convertible to the given result type, everything works just
+fine.
+
+As a side note, members of classes may or may not be associated with instances.
+If they are not, the first argument of the function type must be that of the
+class on which the members operate and an instance of this class must obviously
+be passed when invoking the delegate:
+
+```cpp
+entt::delegate<void(my_struct &, int)> delegate;
+delegate.connect<&my_struct::f>();
+
+my_struct instance;
+delegate(instance, 42);
+```
+
+In this case, it's not possible to _deduce_ the function type since the first
+argument doesn't necessarily have to be a reference (for example, it can be a
+pointer, as well as a const reference).<br/>
+Therefore, the function type must be declared explicitly for unbound members.
+
+## Runtime arguments
+
+The `delegate` class is meant to be used primarily with template arguments.
+However, as a consequence of its design, it also offers minimal support for
+runtime arguments.<br/>
+When used like this, some features aren't supported though. In particular:
+
+* Curried functions aren't accepted.
+* Functions with an argument list that differs from that of the delegate aren't
+  supported.
+* Return type and types of arguments **must** coincide with those of the
+  delegate and _being at least convertible_ isn't enough anymore.
+
+Moreover, for a given function type `Ret(Args...)`, the signature of the
+functions connected at runtime must necessarily be `Ret(const void *, Args...)`.
+
+Runtime arguments can be passed both to the constructor of a delegate and to the
+`connect` member function. An optional parameter is also accepted in both cases.
+This argument is used to pass arbitrary user data back and forth as a
+`const void *` upon invocation.<br/>
+To connect a function to a delegate _in the hard way_:
+
+```cpp
+int func(const void *ptr, int i) { return *static_cast<const int *>(ptr) * i; }
+const int value = 42;
+
+// use the constructor ...
+entt::delegate delegate{&func, &value};
+
+// ... or the connect member function
+delegate.connect(&func, &value);
+```
+
+The type of the delegate is deduced from the function if possible. In this case,
+since the first argument is an implementation detail, the deduced function type
+is `int(int)`.<br/>
+Invoking a delegate built in this way follows the same rules as previously
+explained.
+
+## Lambda support
+
+In general, the `delegate` class doesn't fully support lambda functions in all
+their nuances. The reason is pretty simple: a `delegate` isn't a drop-in
+replacement for an `std::function`. Instead, it tries to overcome the problems
+with the latter.<br/>
+That being said, non-capturing lambda functions are supported, even though some
+features aren't available in this case.
+
+This is a logical consequence of the support for connecting functions at
+runtime. Therefore, lambda functions undergo the same rules and
+limitations.<br/>
+In fact, since non-capturing lambda functions decay to pointers to functions,
+they can be used with a `delegate` as if they were _normal functions_ with
+optional payload:
+
+```cpp
+my_struct instance;
+
+// use the constructor ...
+entt::delegate delegate{+[](const void *ptr, int value) {
+    return static_cast<const my_struct *>(ptr)->f(value);
+}, &instance};
+
+// ... or the connect member function
+delegate.connect([](const void *ptr, int value) {
+    return static_cast<const my_struct *>(ptr)->f(value);
+}, &instance);
+```
+
+As above, the first parameter (`const void *`) isn't part of the function type
+of the delegate and is used to dispatch arbitrary user data back and forth. In
+other terms, the function type of the delegate above is `int(int)`.
+
+# Signals
+
+Signal handlers work with references to classes, function pointers and pointers
+to members. Listeners can be any kind of objects and users are in charge of
+connecting and disconnecting them from a signal to avoid crashes due to
+different lifetimes. On the other side, performance shouldn't be affected that
+much by the presence of such a signal handler.<br/>
+Signals make use of delegates internally and therefore they undergo the same
+rules and offer similar functionalities. It may be a good idea to consult the
+documentation of the `delegate` class for further information.
+
+A signal handler is can be used as a private data member without exposing any
+_publish_ functionality to the clients of a class.<br/>
+The basic idea is to impose a clear separation between the signal itself and the
+`sink` class, that is a tool to be used to connect and disconnect listeners on
+the fly.
+
+The API of a signal handler is straightforward. If a collector is supplied to
+the signal when something is published, all the values returned by its listeners
+are literally _collected_ and used later by the caller. Otherwise, the class
+works just like a plain signal that emits events from time to time.<br/>
+To create instances of signal handlers it's sufficient to provide the type of
+function to which they refer:
+
+```cpp
+entt::sigh<void(int, char)> signal;
+```
+
+Signals offer all the basic functionalities required to know how many listeners
+they contain (`size`) or if they contain at least a listener (`empty`), as well
+as a function to use to swap handlers (`swap`).
+
+Besides them, there are member functions to use both to connect and disconnect
+listeners in all their forms by means of a sink:
+
+```cpp
+void foo(int, char) { /* ... */ }
+
+struct listener {
+    void bar(const int &, char) { /* ... */ }
+};
+
+// ...
+
+entt::sink sink{signal};
+listener instance;
+
+sink.connect<&foo>();
+sink.connect<&listener::bar>(instance);
+
+// ...
+
+// disconnects a free function
+sink.disconnect<&foo>();
+
+// disconnect a member function of an instance
+sink.disconnect<&listener::bar>(instance);
+
+// disconnect all member functions of an instance, if any
+sink.disconnect(instance);
+
+// discards all listeners at once
+sink.disconnect();
+```
+
+As shown above, listeners don't have to strictly follow the signature of the
+signal. As long as a listener can be invoked with the given arguments to yield a
+result that is convertible to the given return type, everything works just
+fine.<br/>
+It's also possible to connect a listener before other elements already contained
+by the signal. The `before` function returns a `sink` object that is correctly
+initialized for the purpose and can be used to connect one or more listeners in
+order and in the desired position:
+
+```cpp
+sink.before<&foo>().connect<&listener::bar>(instance);
+```
+
+In all cases, the `connect` member function returns by default a `connection`
+object to be used as an alternative to break a connection by means of its
+`release` member function.<br/>
+A `scoped_connection` can also be created from a connection. In this case, the
+link is broken automatically as soon as the object goes out of scope.
+
+Once listeners are attached (or even if there are no listeners at all), events
+and data in general are published through a signal by means of the `publish`
+member function:
+
+```cpp
+signal.publish(42, 'c');
+```
+
+To collect data, the `collect` member function is used instead:
+
+```cpp
+int f() { return 0; }
+int g() { return 1; }
+
+// ...
+
+entt::sigh<int()> signal;
+entt::sink sink{signal};
+
+sink.connect<&f>();
+sink.connect<&g>();
+
+std::vector<int> vec{};
+signal.collect([&vec](int value) { vec.push_back(value); });
+
+assert(vec[0] == 0);
+assert(vec[1] == 1);
+```
+
+A collector must expose a function operator that accepts as an argument a type
+to which the return type of the listeners can be converted. Moreover, it can
+optionally return a boolean value that is true to stop collecting data, false
+otherwise. This way one can avoid calling all the listeners in case it isn't
+necessary.<br/>
+Functors can also be used in place of a lambda. Since the collector is copied
+when invoking the `collect` member function, `std::ref` is the way to go in this
+case:
+
+```cpp
+struct my_collector {
+    std::vector<int> vec{};
+
+    bool operator()(int v) {
+        vec.push_back(v);
+        return true;
+    }
+};
+
+// ...
+
+my_collector collector;
+signal.collect(std::ref(collector));
+```
+
+# Event dispatcher
+
+The event dispatcher class allows users to trigger immediate events or to queue
+and publish them all together later.<br/>
+This class lazily instantiates its queues. Therefore, it's not necessary to
+_announce_ the event types in advance:
+
+```cpp
+// define a general purpose dispatcher
+entt::dispatcher dispatcher{};
+```
+
+A listener registered with a dispatcher is such that its type offers one or more
+member functions that take arguments of type `Event &` for any type of event,
+regardless of the return value.<br/>
+These functions are linked directly via `connect` to a _sink_:
+
+```cpp
+struct an_event { int value; };
+struct another_event {};
+
+struct listener {
+    void receive(const an_event &) { /* ... */ }
+    void method(const another_event &) { /* ... */ }
+};
+
+// ...
+
+listener listener;
+dispatcher.sink<an_event>().connect<&listener::receive>(listener);
+dispatcher.sink<another_event>().connect<&listener::method>(listener);
+```
+
+Note that connecting listeners within event handlers can result in undefined
+behavior.<br/>
+The `disconnect` member function is used to remove one listener at a time or all
+of them at once:
+
+```cpp
+dispatcher.sink<an_event>().disconnect<&listener::receive>(listener);
+dispatcher.sink<another_event>().disconnect(listener);
+```
+
+The `trigger` member function serves the purpose of sending an immediate event
+to all the listeners registered so far:
+
+```cpp
+dispatcher.trigger(an_event{42});
+dispatcher.trigger<another_event>();
+```
+
+Listeners are invoked immediately, order of execution isn't guaranteed. This
+method can be used to push around urgent messages like an _is terminating_
+notification on a mobile app.
+
+On the other hand, the `enqueue` member function queues messages together and
+helps to maintain control over the moment they are sent to listeners:
+
+```cpp
+dispatcher.enqueue<an_event>(42);
+dispatcher.enqueue(another_event{});
+```
+
+Events are stored aside until the `update` member function is invoked:
+
+```cpp
+// emits all the events of the given type at once
+dispatcher.update<an_event>();
+
+// emits all the events queued so far at once
+dispatcher.update();
+```
+
+This way users can embed the dispatcher in a loop and literally dispatch events
+once per tick to their systems.
+
+## Named queues
+
+All queues within a dispatcher are associated by default with an event type and
+then retrieved from it.<br/>
+However, it's possible to create queues with different _names_ (and therefore
+also multiple queues for a single type). In fact, more or less all functions
+also take an additional parameter. As an example:
+
+```cpp
+dispatcher.sink<an_event>("custom"_hs).connect<&listener::receive>(listener);
+```
+
+In this case, the term _name_ is misused as these are actual numeric identifiers
+of type `id_type`.<br/>
+An exception to this rule is the `enqueue` function. There is no additional
+parameter for it but rather a different function:
+
+```cpp
+dispatcher.enqueue_hint<an_event>("custom"_hs, 42);
+```
+
+This is mainly due to the template argument deduction rules and unfortunately
+there is no real (elegant) way to avoid it.
+
+# Event emitter
+
+A general purpose event emitter thought mainly for those cases where it comes to
+working with asynchronous stuff.<br/>
+Originally designed to fit the requirements of
+[`uvw`](https://github.com/skypjack/uvw) (a wrapper for `libuv` written in
+modern C++), it was adapted later to be included in this library.
+
+To create an emitter type, derived classes must inherit from the base as:
+
+```cpp
+struct my_emitter: emitter<my_emitter> {
+    // ...
+}
+```
+
+Handlers for the different events are created internally on the fly. It's not
+required to specify in advance the full list of accepted events.<br/>
+Moreover, whenever an event is published, an emitter also passes a reference
+to itself to its listeners.
+
+To create new instances of an emitter, no arguments are required:
+
+```cpp
+my_emitter emitter{};
+```
+
+Listeners are movable and callable objects (free functions, lambdas, functors,
+`std::function`s, whatever) whose function type is compatible with:
+
+```cpp
+void(Type &, my_emitter &)
+```
+
+Where `Type` is the type of event they want to receive.<br/>
+To attach a listener to an emitter, there exists the `on` member function:
+
+```cpp
+emitter.on<my_event>([](const my_event &event, my_emitter &emitter) {
+    // ...
+});
+```
+
+Similarly, the `reset` member function is used to disconnect listeners given a
+type while `clear` is used to disconnect all listeners at once:
+
+```cpp
+// resets the listener for my_event
+emitter.erase<my_event>();
+
+// resets all listeners
+emitter.clear()
+```
+
+To send an event to the listener registered on a given type, the `publish`
+function is the way to go:
+
+```cpp
+struct my_event { int i; };
+
+// ...
+
+emitter.publish(my_event{42});
+```
+
+Finally, the `empty` member function tests if there exists at least a listener
+registered with the event emitter while `contains` is used to check if a given
+event type is associated with a valid listener:
+
+```cpp
+if(emitter.contains<my_event>()) {
+    // ...
+}
+```
+
+This class introduces a _nice-to-have_ model based on events and listeners.<br/>
+More in general, it's a handy tool when the derived classes _wrap_ asynchronous
+operations but it's not limited to such uses.
--- a/external/entt/entt/docs/md/unreal.md
+++ b/external/entt/entt/docs/md/unreal.md
@ -0,0 +1,107 @@
+# EnTT and Unreal Engine
+
+<!--
+@cond TURN_OFF_DOXYGEN
+-->
+# Table of Contents
+
+* [Enable Cpp17](#enable-cpp17)
+* [EnTT as a third party module](#entt-as-a-third-party-module)
+* [Include EnTT](#include-entt)
+<!--
+@endcond TURN_OFF_DOXYGEN
+-->
+
+## Enable Cpp17
+
+As of writing (Unreal Engine v4.25), the default C++ standard of Unreal Engine
+is C++14.<br/>
+On the other hand, note that `EnTT` requires C++17 to compile. To enable it, in
+the main module of the project there should be a `<Game Name>.Build.cs` file,
+the constructor of which must contain the following lines:
+
+```cs
+PCHUsage = PCHUsageMode.NoSharedPCHs;
+PrivatePCHHeaderFile = "<PCH filename>.h";
+CppStandard = CppStandardVersion.Cpp17;
+```
+
+Replace `<PCH filename>.h` with the name of the already existing PCH header
+file, if any.<br/>
+In case the project doesn't already contain a file of this type, it's possible
+to create one with the following content:
+
+```cpp
+#pragma once
+#include "CoreMinimal.h"
+```
+
+Remember to remove any old `PCHUsage = <...>` line that was previously there. At
+this point, C++17 support should be in place.<br/>
+Try to compile the project to ensure it works as expected before following
+further steps.
+
+Note that updating a *project* to C++17 doesn't necessarily mean that the IDE in
+use will also start to recognize its syntax.<br/>
+If the plan is to use C++17 in the project too, check the specific instructions
+for the IDE in use.
+
+## EnTT as a third party module
+
+Once this point is reached, the `Source` directory should look like this:
+
+```
+Source
+|  MyGame.Target.cs
+|  MyGameEditor.Target.cs
+|
+---MyGame
+|  |  MyGame.Build.cs
+|  |  MyGame.h (PCH Header file)
+|
+\---ThirdParty
+   \---EnTT
+      |   EnTT.Build.cs
+      |
+      \---entt (GitHub repository content inside)
+```
+
+To make this happen, create the folder `ThirdParty` under `Source` if it doesn't
+exist already. Then, add an `EnTT` folder under `ThirdParty`.<br/>
+Within the latter, create a new file `EnTT.Build.cs` with the following content:
+
+```cs
+using System.IO;
+using UnrealBuildTool;
+
+public class EnTT: ModuleRules {
+    public EnTT(ReadOnlyTargetRules Target) : base(Target) {
+        Type = ModuleType.External;
+        PublicIncludePaths.Add(Path.Combine(ModuleDirectory, "entt", "src", "entt"));
+    }
+}
+```
+
+The last line indicates that the actual files will be found in the directory
+`EnTT/entt/src/entt`.<br/>
+Download the repository for `EnTT` and place it next to `EnTT.Build.cs` or
+update the path above accordingly.
+
+Finally, open the `<Game Name>.Build.cs` file and add `EnTT` as a dependency at
+the end of the list:
+
+```cs
+PublicDependencyModuleNames.AddRange(new[] {
+    "Core", "CoreUObject", "Engine", "InputCore", [...], "EnTT"
+});
+```
+
+Note that some IDEs might require a restart to start recognizing the new module
+for code-highlighting features and such.
+
+## Include EnTT
+
+In any source file of the project, add `#include "entt.hpp"` or any other path
+to the file from `EnTT` to use it.<br/>
+Try to create a registry as `entt::registry registry;` to make sure everything
+compiles fine.
--- a/external/entt/entt/entt.imp
+++ b/external/entt/entt/entt.imp
@ -0,0 +1,34 @@
+[
+  { "include": [ "@<gtest/internal/.*>", "private", "<gtest/gtest.h>", "public" ] },
+  { "include": [ "@<gtest/gtest-.*>", "private", "<gtest/gtest.h>", "public" ] },
+  { "include": [ "@[\"<].*/container/fwd.hpp[\">]", "private", "<entt/container/dense_map.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/container/fwd.hpp[\">]", "private", "<entt/container/dense_set.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/any.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/family.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/hashed_string.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/ident.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/monostate.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/type_info.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/core/fwd.hpp[\">]", "private", "<entt/core/type_traits.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/entity.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/group.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/handle.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/helper.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/observer.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/organizer.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/registry.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/runtime_view.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/snapshot.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/sparse_set.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/storage.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/entity/fwd.hpp[\">]", "private", "<entt/entity/view.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/meta/fwd.hpp[\">]", "private", "<entt/meta/meta.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/poly/fwd.hpp[\">]", "private", "<entt/poly/poly.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/resource/fwd.hpp[\">]", "private", "<entt/resource/cache.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/resource/fwd.hpp[\">]", "private", "<entt/resource/loader.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/resource/fwd.hpp[\">]", "private", "<entt/resource/resource.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/delegate.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/dispatcher.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/emitter.hpp>", "public" ] },
+  { "include": [ "@[\"<].*/signal/fwd.hpp[\">]", "private", "<entt/signal/sigh.hpp>", "public" ] }
+]
--- a/external/entt/entt/natvis/entt/config.natvis
+++ b/external/entt/entt/natvis/entt/config.natvis
@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/container.natvis
+++ b/external/entt/entt/natvis/entt/container.natvis
@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::dense_map&lt;*&gt;">
+		<Intrinsic Name="size" Expression="packed.first_base::value.size()"/>
+		<Intrinsic Name="bucket_count" Expression="sparse.first_base::value.size()"/>
+		<DisplayString>{{ size={ size() } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" ExcludeView="simple">packed.first_base::value.capacity()</Item>
+			<Item Name="[bucket_count]" ExcludeView="simple">bucket_count()</Item>
+			<Item Name="[load_factor]" ExcludeView="simple">(float)size() / (float)bucket_count()</Item>
+			<Item Name="[max_load_factor]" ExcludeView="simple">threshold</Item>
+			<IndexListItems>
+				<Size>size()</Size>
+				<ValueNode>packed.first_base::value[$i].element</ValueNode>
+			</IndexListItems>
+		</Expand>
+	</Type>
+	<Type Name="entt::dense_set&lt;*&gt;">
+		<Intrinsic Name="size" Expression="packed.first_base::value.size()"/>
+		<Intrinsic Name="bucket_count" Expression="sparse.first_base::value.size()"/>
+		<DisplayString>{{ size={ size() } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" ExcludeView="simple">packed.first_base::value.capacity()</Item>
+			<Item Name="[bucket_count]" ExcludeView="simple">bucket_count()</Item>
+			<Item Name="[load_factor]" ExcludeView="simple">(float)size() / (float)bucket_count()</Item>
+			<Item Name="[max_load_factor]" ExcludeView="simple">threshold</Item>
+			<IndexListItems>
+				<Size>size()</Size>
+				<ValueNode>packed.first_base::value[$i].second</ValueNode>
+			</IndexListItems>
+		</Expand>
+	</Type>
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/core.natvis
+++ b/external/entt/entt/natvis/entt/core.natvis
@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+    <Type Name="entt::basic_any&lt;*&gt;">
+		<DisplayString>{{ type={ info->alias,na }, policy={ mode,en } }}</DisplayString>
+    </Type>
+	<Type Name="entt::compressed_pair&lt;*&gt;">
+		<Intrinsic Name="first" Optional="true" Expression="((first_base*)this)->value"/>
+		<Intrinsic Name="first" Optional="true" Expression="*(first_base::base_type*)this"/>
+		<Intrinsic Name="second" Optional="true" Expression="((second_base*)this)->value"/>
+		<Intrinsic Name="second" Optional="true" Expression="*(second_base::base_type*)this"/>
+		<DisplayString >({ first() }, { second() })</DisplayString>
+		<Expand>
+			<Item Name="[first]">first()</Item>
+			<Item Name="[second]">second()</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_hashed_string&lt;*&gt;">
+		<DisplayString Condition="base_type::repr != nullptr">{{ hash={ base_type::hash } }}</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<Item Name="[data]">base_type::repr,na</Item>
+			<Item Name="[length]">base_type::length</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::type_info">
+		<DisplayString>{{ name={ alias,na } }}</DisplayString>
+		<Expand>
+			<Item Name="[hash]">identifier</Item>
+			<Item Name="[index]">seq</Item>
+		</Expand>
+	</Type>
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/entity.natvis
+++ b/external/entt/entt/natvis/entt/entity.natvis
@ -0,0 +1,153 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::basic_registry&lt;*&gt;">
+		<Intrinsic Name="pools_size" Expression="pools.packed.first_base::value.size()"/>
+		<Intrinsic Name="vars_size" Expression="vars.ctx.packed.first_base::value.size()"/>
+		<Intrinsic Name="to_entity" Expression="*((entity_traits::entity_type *)&amp;entity) &amp; entity_traits::entity_mask">
+			<Parameter Name="entity" Type="entity_traits::value_type &amp;"/>
+		</Intrinsic>
+		<DisplayString>{{ size={ epool.size() } }}</DisplayString>
+		<Expand>
+			<Item IncludeView="simple" Name="[epool]">epool,view(simple)nr</Item>
+			<Synthetic Name="[epool]" ExcludeView="simple">
+				<DisplayString>{ epool.size() }</DisplayString>
+				<Expand>
+					<CustomListItems>
+						<Variable Name="pos" InitialValue="0" />
+						<Variable Name="last" InitialValue="epool.size()"/>
+						<Loop>
+							<Break Condition="pos == last"/>
+							<If Condition="to_entity(epool[pos]) == pos">
+								<Item Name="[{ pos }]">epool[pos]</Item>
+							</If>
+							<Exec>++pos</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+			<Synthetic Name="[destroyed]" ExcludeView="simple">
+				<DisplayString>{ to_entity(free_list) != entity_traits::entity_mask }</DisplayString>
+				<Expand>
+					<CustomListItems>
+						<Variable Name="it" InitialValue="to_entity(free_list)" />
+						<Loop>
+							<Break Condition="it == entity_traits::entity_mask"/>
+							<Item Name="[{ it }]">epool[it]</Item>
+							<Exec>it = to_entity(epool[it])</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+			<Synthetic Name="[pools]">
+				<DisplayString>{ pools_size() }</DisplayString>
+				<Expand>
+					<IndexListItems ExcludeView="simple">
+						<Size>pools_size()</Size>
+						<ValueNode>*pools.packed.first_base::value[$i].element.second</ValueNode>
+					</IndexListItems>
+					<IndexListItems IncludeView="simple">
+						<Size>pools_size()</Size>
+						<ValueNode>*pools.packed.first_base::value[$i].element.second,view(simple)</ValueNode>
+					</IndexListItems>
+				</Expand>
+			</Synthetic>
+			<Item Name="[groups]" ExcludeView="simple">groups.size()</Item>
+			<Synthetic Name="[vars]">
+				<DisplayString>{ vars_size() }</DisplayString>
+				<Expand>
+					<IndexListItems>
+						<Size>vars_size()</Size>
+						<ValueNode>vars.ctx.packed.first_base::value[$i].element.second</ValueNode>
+					</IndexListItems>
+				</Expand>
+			</Synthetic>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_sparse_set&lt;*&gt;">
+		<DisplayString>{{ size={ packed.size() }, type={ info->alias,na } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" ExcludeView="simple">packed.capacity()</Item>
+			<Item Name="[policy]">mode,en</Item>
+			<Synthetic Name="[sparse]">
+				<DisplayString>{ sparse.size() * entity_traits::page_size }</DisplayString>
+				<Expand>
+					<ExpandedItem IncludeView="simple">sparse,view(simple)</ExpandedItem>
+					<CustomListItems ExcludeView="simple">
+						<Variable Name="pos" InitialValue="0"/>
+						<Variable Name="page" InitialValue="0"/>
+						<Variable Name="offset" InitialValue="0"/>
+						<Variable Name="last" InitialValue="sparse.size() * entity_traits::page_size"/>
+						<Loop>
+							<Break Condition="pos == last"/>
+							<Exec>page = pos / entity_traits::page_size</Exec>
+							<Exec>offset = pos &amp; (entity_traits::page_size - 1)</Exec>
+							<If Condition="sparse[page] &amp;&amp; (*((entity_traits::entity_type *)&amp;sparse[page][offset]) &lt; ~entity_traits::entity_mask)">
+								<Item Name="[{ pos }]">*((entity_traits::entity_type *)&amp;sparse[page][offset]) &amp; entity_traits::entity_mask</Item>
+							</If>
+							<Exec>++pos</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+			<Synthetic Name="[packed]">
+				<DisplayString>{ packed.size() }</DisplayString>
+				<Expand>
+					<ExpandedItem IncludeView="simple">packed,view(simple)</ExpandedItem>
+					<CustomListItems ExcludeView="simple">
+						<Variable Name="pos" InitialValue="0"/>
+						<Variable Name="last" InitialValue="packed.size()"/>
+						<Loop>
+							<Break Condition="pos == last"/>
+							<If Condition="*((entity_traits::entity_type *)&amp;packed[pos]) &lt; ~entity_traits::entity_mask">
+								<Item Name="[{ pos }]">packed[pos]</Item>
+							</If>
+							<Exec>++pos</Exec>
+						</Loop>
+					</CustomListItems>
+				</Expand>
+			</Synthetic>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_storage&lt;*&gt;">
+		<DisplayString>{{ size={ base_type::packed.size() }, type={ base_type::info->alias,na } }}</DisplayString>
+		<Expand>
+			<Item Name="[capacity]" Optional="true" ExcludeView="simple">packed.first_base::value.capacity() * comp_traits::page_size</Item>
+			<Item Name="[page size]" Optional="true" ExcludeView="simple">comp_traits::page_size</Item>
+			<Item Name="[base]" ExcludeView="simple">(base_type*)this,nand</Item>
+			<Item Name="[base]" IncludeView="simple">(base_type*)this,view(simple)nand</Item>
+			<!-- having SFINAE-like techniques in natvis is priceless :) -->
+			<CustomListItems Condition="packed.first_base::value.size() != 0" Optional="true">
+				<Variable Name="pos" InitialValue="0" />
+				<Variable Name="last" InitialValue="base_type::packed.size()"/>
+				<Loop>
+					<Break Condition="pos == last"/>
+					<If Condition="*((base_type::entity_traits::entity_type *)&amp;base_type::packed[pos]) &lt; ~base_type::entity_traits::entity_mask">
+						<Item Name="[{ pos }:{ base_type::packed[pos] }]">packed.first_base::value[pos / comp_traits::page_size][pos &amp; (comp_traits::page_size - 1)]</Item>
+					</If>
+					<Exec>++pos</Exec>
+				</Loop>
+			</CustomListItems>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_view&lt;*&gt;">
+		<DisplayString>{{ size_hint={ view->packed.size() } }}</DisplayString>
+		<Expand>
+			<Item Name="[pools]">pools,na</Item>
+			<Item Name="[filter]">filter,na</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_runtime_view&lt;*&gt;">
+		<DisplayString Condition="pools.size() != 0u">{{ size_hint={ pools[0]->packed.size() } }}</DisplayString>
+		<DisplayString>{{ size_hint=0 }}</DisplayString>
+		<Expand>
+			<Item Name="[pools]">pools,na</Item>
+			<Item Name="[filter]">filter,na</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::null_t">
+		<DisplayString>&lt;null&gt;</DisplayString>
+	</Type>
+	<Type Name="entt::tombstone_t">
+		<DisplayString>&lt;tombstone&gt;</DisplayString>
+	</Type>
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/graph.natvis
+++ b/external/entt/entt/natvis/entt/graph.natvis
@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+    <Type Name="entt::adjacency_matrix&lt;*&gt;">
+		<DisplayString>{{ size={ vert } }}</DisplayString>
+        <Expand>
+			<CustomListItems>
+				<Variable Name="pos" InitialValue="0" />
+				<Variable Name="last" InitialValue="vert * vert"/>
+				<Loop>
+					<Break Condition="pos == last"/>
+					<If Condition="matrix[pos] != 0u">
+						<Item Name="{pos / vert}">pos % vert</Item>
+					</If>
+					<Exec>++pos</Exec>
+				</Loop>
+			</CustomListItems>
+        </Expand>
+    </Type>
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/locator.natvis
+++ b/external/entt/entt/natvis/entt/locator.natvis
@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/meta.natvis
+++ b/external/entt/entt/natvis/entt/meta.natvis
@ -0,0 +1,121 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::internal::meta_base_node">
+		<DisplayString>{{}}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_conv_node">
+		<DisplayString>{{}}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_ctor_node">
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_data_node">
+		<Intrinsic Name="has_property" Expression="!!(traits &amp; property)">
+			<Parameter Name="property" Type="int"/>
+		</Intrinsic>
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+		<Expand>
+			<Item Name="[arity]">arity</Item>
+			<Item Name="[is_const]">has_property(entt::internal::meta_traits::is_const)</Item>
+			<Item Name="[is_static]">has_property(entt::internal::meta_traits::is_static)</Item>
+			<Item Name="[prop]">prop</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::internal::meta_func_node"	>
+		<Intrinsic Name="has_property" Expression="!!(traits &amp; property)">
+			<Parameter Name="property" Type="int"/>
+		</Intrinsic>
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+		<Expand>
+			<Item Name="[is_const]">has_property(entt::internal::meta_traits::is_const)</Item>
+			<Item Name="[is_static]">has_property(entt::internal::meta_traits::is_static)</Item>
+			<Item Name="[next]" Condition="next != nullptr">*next</Item>
+			<Item Name="[prop]">prop</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::internal::meta_prop_node">
+		<DisplayString>{ value }</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_template_node">
+		<DisplayString>{{ arity={ arity } }}</DisplayString>
+	</Type>
+	<Type Name="entt::internal::meta_type_node">
+		<Intrinsic Name="has_property" Expression="!!(traits &amp; property)">
+			<Parameter Name="property" Type="int"/>
+		</Intrinsic>
+		<DisplayString Condition="info != nullptr">{{ type={ info->alias,na } }}</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<Item Name="[id]">id</Item>
+			<Item Name="[sizeof]">size_of</Item>
+			<Item Name="[is_arithmetic]">has_property(entt::internal::meta_traits::is_arithmetic)</Item>
+			<Item Name="[is_integral]">has_property(entt::internal::meta_traits::is_integral)</Item>
+			<Item Name="[is_signed]">has_property(entt::internal::meta_traits::is_signed)</Item>
+			<Item Name="[is_array]">has_property(entt::internal::meta_traits::is_array)</Item>
+			<Item Name="[is_enum]">has_property(entt::internal::meta_traits::is_enum)</Item>
+			<Item Name="[is_class]">has_property(entt::internal::meta_traits::is_class)</Item>
+			<Item Name="[is_meta_pointer_like]">has_property(entt::internal::meta_traits::is_meta_pointer_like)</Item>
+			<Item Name="[is_meta_sequence_container]">has_property(entt::internal::meta_traits::is_meta_sequence_container)</Item>
+			<Item Name="[is_meta_associative_container]">has_property(entt::internal::meta_traits::is_meta_associative_container)</Item>
+			<Item Name="[default_constructor]">default_constructor != nullptr</Item>
+			<Item Name="[conversion_helper]">conversion_helper != nullptr</Item>
+			<Item Name="[from_void]">from_void != nullptr</Item>
+			<Item Name="[template_info]">templ</Item>
+			<Item Name="[details]" Condition="details != nullptr">*details</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_any">
+		<DisplayString Condition="node.info != nullptr">{{ type={ node.info->alias,na }, policy={ storage.mode,en } }}</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem>node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_handle">
+		<DisplayString>{ any }</DisplayString>
+	</Type>
+	<Type Name="entt::meta_associative_container">
+		<DisplayString>{ storage }</DisplayString>
+		<Expand>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_sequence_container">
+		<DisplayString>{ storage }</DisplayString>
+		<Expand>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_data">
+		<DisplayString Condition="node != nullptr">{ *node }</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem Condition="node != nullptr">node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_func">
+		<DisplayString Condition="node != nullptr">{ *node }</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem Condition="node != nullptr">node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_prop">
+		<DisplayString Condition="node != nullptr">{ *node }</DisplayString>
+		<DisplayString>{{}}</DisplayString>
+		<Expand>
+			<ExpandedItem Condition="node != nullptr">node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::meta_type">
+		<DisplayString>{ node }</DisplayString>
+		<Expand>
+			<ExpandedItem>node</ExpandedItem>
+			<Item Name="[context]" Condition="ctx != nullptr">ctx->value</Item>
+		</Expand>
+	</Type>
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/platform.natvis
+++ b/external/entt/entt/natvis/entt/platform.natvis
@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/poly.natvis
+++ b/external/entt/entt/natvis/entt/poly.natvis
@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::basic_poly&lt;*&gt;">
+		<DisplayString>{ storage }</DisplayString>
+	</Type>
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/process.natvis
+++ b/external/entt/entt/natvis/entt/process.natvis
@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/resource.natvis
+++ b/external/entt/entt/natvis/entt/resource.natvis
@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::resource&lt;*&gt;">
+		<DisplayString>{ value }</DisplayString>
+		<Expand>
+			<ExpandedItem>value</ExpandedItem>
+		</Expand>
+	</Type>
+	<Type Name="entt::resource_cache&lt;*&gt;">
+		<DisplayString>{ pool.first_base::value }</DisplayString>
+		<Expand>
+			<ExpandedItem>pool.first_base::value</ExpandedItem>
+		</Expand>
+	</Type>
+</AutoVisualizer>
--- a/external/entt/entt/natvis/entt/signal.natvis
+++ b/external/entt/entt/natvis/entt/signal.natvis
@ -0,0 +1,56 @@
+<?xml version="1.0" encoding="utf-8"?>
+<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
+	<Type Name="entt::delegate&lt;*&gt;">
+		<DisplayString>{{ type={ "$T1" } }}</DisplayString>
+		<Expand>
+			<Item Name="[empty]">fn == nullptr</Item>
+			<Item Name="[data]">instance</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::basic_dispatcher&lt;*&gt;">
+		<Intrinsic Name="size" Expression="pools.first_base::value.packed.first_base::value.size()"/>
+		<DisplayString>{{ size={ size() } }}</DisplayString>
+		<Expand>
+			<Synthetic Name="[pools]">
+				<DisplayString>{ size() }</DisplayString>
+				<Expand>
+					<IndexListItems>
+						<Size>size()</Size>
+						<ValueNode>*pools.first_base::value.packed.first_base::value[$i].element.second</ValueNode>
+					</IndexListItems>
+				</Expand>
+			</Synthetic>
+		</Expand>
+	</Type>
+	<Type Name="entt::internal::dispatcher_handler&lt;*&gt;">
+		<DisplayString>{{ size={ events.size() }, event={ "$T1" } }}</DisplayString>
+		<Expand>
+			<Item Name="[signal]">signal</Item>
+		</Expand>
+	</Type>
+	<Type Name="entt::emitter&lt;*&gt;">
+		<DisplayString>{{ size={ handlers.first_base::value.packed.first_base::value.size() } }}</DisplayString>
+	</Type>
+	<Type Name="entt::connection">
+		<DisplayString>{{ bound={ signal != nullptr } }}</DisplayString>
+	</Type>
+	<Type Name="entt::scoped_connection">
+		<DisplayString>{ conn }</DisplayString>
+	</Type>
+	<Type Name="entt::sigh&lt;*&gt;">
+		<DisplayString>{{ size={ calls.size() }, type={ "$T1" } }}</DisplayString>
+		<Expand>
+			<IndexListItems>
+				<Size>calls.size()</Size>
+				<ValueNode>calls[$i]</ValueNode>
+			</IndexListItems>
+		</Expand>
+	</Type>
+	<Type Name="entt::sink&lt;*&gt;">
+		<DisplayString>{{ type={ "$T1" } }}</DisplayString>
+		<Expand>
+			<Item Name="[signal]">signal,na</Item>
+			<Item Name="[offset]">offset</Item>
+		</Expand>
+	</Type>
+</AutoVisualizer>
--- a/external/entt/entt/scripts/amalgamate.py
+++ b/external/entt/entt/scripts/amalgamate.py
@ -0,0 +1,299 @@
+#!/usr/bin/env python
+# coding=utf-8
+
+# amalgamate.py - Amalgamate C source and header files.
+# Copyright (c) 2012, Erik Edlund <erik.edlund@32767.se>
+# 
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+# 
+#  * Redistributions of source code must retain the above copyright notice,
+#  this list of conditions and the following disclaimer.
+# 
+#  * Redistributions in binary form must reproduce the above copyright notice,
+#  this list of conditions and the following disclaimer in the documentation
+#  and/or other materials provided with the distribution.
+# 
+#  * Neither the name of Erik Edlund, nor the names of its contributors may
+#  be used to endorse or promote products derived from this software without
+#  specific prior written permission.
+# 
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+
+import argparse
+import datetime
+import json
+import os
+import re
+
+
+class Amalgamation(object):
+
+    # Prepends self.source_path to file_path if needed.
+    def actual_path(self, file_path):
+        if not os.path.isabs(file_path):
+            file_path = os.path.join(self.source_path, file_path)
+        return file_path
+
+    # Search included file_path in self.include_paths and
+    # in source_dir if specified.
+    def find_included_file(self, file_path, source_dir):
+        search_dirs = self.include_paths[:]
+        if source_dir:
+            search_dirs.insert(0, source_dir)
+
+        for search_dir in search_dirs:
+            search_path = os.path.join(search_dir, file_path)
+            if os.path.isfile(self.actual_path(search_path)):
+                return search_path
+        return None
+
+    def __init__(self, args):
+        with open(args.config, 'r') as f:
+            config = json.loads(f.read())
+            for key in config:
+                setattr(self, key, config[key])
+
+            self.verbose = args.verbose == "yes"
+            self.prologue = args.prologue
+            self.source_path = args.source_path
+            self.included_files = []
+
+    # Generate the amalgamation and write it to the target file.
+    def generate(self):
+        amalgamation = ""
+
+        if self.prologue:
+            with open(self.prologue, 'r') as f:
+                amalgamation += datetime.datetime.now().strftime(f.read())
+
+        if self.verbose:
+            print("Config:")
+            print(" target        = {0}".format(self.target))
+            print(" working_dir   = {0}".format(os.getcwd()))
+            print(" include_paths = {0}".format(self.include_paths))
+        print("Creating amalgamation:")
+        for file_path in self.sources:
+            # Do not check the include paths while processing the source
+            # list, all given source paths must be correct.
+            # actual_path = self.actual_path(file_path)
+            print(" - processing \"{0}\"".format(file_path))
+            t = TranslationUnit(file_path, self, True)
+            amalgamation += t.content
+
+        with open(self.target, 'w') as f:
+            f.write(amalgamation)
+
+        print("...done!\n")
+        if self.verbose:
+            print("Files processed: {0}".format(self.sources))
+            print("Files included: {0}".format(self.included_files))
+        print("")
+
+
+def _is_within(match, matches):
+    for m in matches:
+        if match.start() > m.start() and \
+                match.end() < m.end():
+            return True
+    return False
+
+
+class TranslationUnit(object):
+    # // C++ comment.
+    cpp_comment_pattern = re.compile(r"//.*?\n")
+
+    # /* C comment. */
+    c_comment_pattern = re.compile(r"/\*.*?\*/", re.S)
+
+    # "complex \"stri\\\ng\" value".
+    string_pattern = re.compile("[^']" r'".*?(?<=[^\\])"', re.S)
+
+    # Handle simple include directives. Support for advanced
+    # directives where macros and defines needs to expanded is
+    # not a concern right now.
+    include_pattern = re.compile(
+        r'#\s*include\s+(<|")(?P<path>.*?)("|>)', re.S)
+
+    # #pragma once
+    pragma_once_pattern = re.compile(r'#\s*pragma\s+once', re.S)
+
+    # Search for pattern in self.content, add the match to
+    # contexts if found and update the index accordingly.
+    def _search_content(self, index, pattern, contexts):
+        match = pattern.search(self.content, index)
+        if match:
+            contexts.append(match)
+            return match.end()
+        return index + 2
+
+    # Return all the skippable contexts, i.e., comments and strings
+    def _find_skippable_contexts(self):
+        # Find contexts in the content in which a found include
+        # directive should not be processed.
+        skippable_contexts = []
+
+        # Walk through the content char by char, and try to grab
+        # skippable contexts using regular expressions when found.
+        i = 1
+        content_len = len(self.content)
+        while i < content_len:
+            j = i - 1
+            current = self.content[i]
+            previous = self.content[j]
+
+            if current == '"':
+                # String value.
+                i = self._search_content(j, self.string_pattern,
+                                         skippable_contexts)
+            elif current == '*' and previous == '/':
+                # C style comment.
+                i = self._search_content(j, self.c_comment_pattern,
+                                         skippable_contexts)
+            elif current == '/' and previous == '/':
+                # C++ style comment.
+                i = self._search_content(j, self.cpp_comment_pattern,
+                                         skippable_contexts)
+            else:
+                # Skip to the next char.
+                i += 1
+
+        return skippable_contexts
+
+    # Returns True if the match is within list of other matches
+
+    # Removes pragma once from content
+    def _process_pragma_once(self):
+        content_len = len(self.content)
+        if content_len < len("#include <x>"):
+            return 0
+
+        # Find contexts in the content in which a found include
+        # directive should not be processed.
+        skippable_contexts = self._find_skippable_contexts()
+
+        pragmas = []
+        pragma_once_match = self.pragma_once_pattern.search(self.content)
+        while pragma_once_match:
+            if not _is_within(pragma_once_match, skippable_contexts):
+                pragmas.append(pragma_once_match)
+
+            pragma_once_match = self.pragma_once_pattern.search(self.content,
+                                                                pragma_once_match.end())
+
+        # Handle all collected pragma once directives.
+        prev_end = 0
+        tmp_content = ''
+        for pragma_match in pragmas:
+            tmp_content += self.content[prev_end:pragma_match.start()]
+            prev_end = pragma_match.end()
+        tmp_content += self.content[prev_end:]
+        self.content = tmp_content
+
+    # Include all trivial #include directives into self.content.
+    def _process_includes(self):
+        content_len = len(self.content)
+        if content_len < len("#include <x>"):
+            return 0
+
+        # Find contexts in the content in which a found include
+        # directive should not be processed.
+        skippable_contexts = self._find_skippable_contexts()
+
+        # Search for include directives in the content, collect those
+        # which should be included into the content.
+        includes = []
+        include_match = self.include_pattern.search(self.content)
+        while include_match:
+            if not _is_within(include_match, skippable_contexts):
+                include_path = include_match.group("path")
+                search_same_dir = include_match.group(1) == '"'
+                found_included_path = self.amalgamation.find_included_file(
+                    include_path, self.file_dir if search_same_dir else None)
+                if found_included_path:
+                    includes.append((include_match, found_included_path))
+
+            include_match = self.include_pattern.search(self.content,
+                                                        include_match.end())
+
+        # Handle all collected include directives.
+        prev_end = 0
+        tmp_content = ''
+        for include in includes:
+            include_match, found_included_path = include
+            tmp_content += self.content[prev_end:include_match.start()]
+            tmp_content += "// {0}\n".format(include_match.group(0))
+            if found_included_path not in self.amalgamation.included_files:
+                t = TranslationUnit(found_included_path, self.amalgamation, False)
+                tmp_content += t.content
+            prev_end = include_match.end()
+        tmp_content += self.content[prev_end:]
+        self.content = tmp_content
+
+        return len(includes)
+
+    # Make all content processing
+    def _process(self):
+        if not self.is_root:
+            self._process_pragma_once()
+        self._process_includes()
+
+    def __init__(self, file_path, amalgamation, is_root):
+        self.file_path = file_path
+        self.file_dir = os.path.dirname(file_path)
+        self.amalgamation = amalgamation
+        self.is_root = is_root
+
+        self.amalgamation.included_files.append(self.file_path)
+
+        actual_path = self.amalgamation.actual_path(file_path)
+        if not os.path.isfile(actual_path):
+            raise IOError("File not found: \"{0}\"".format(file_path))
+        with open(actual_path, 'r') as f:
+            self.content = f.read()
+            self._process()
+
+
+def main():
+    description = "Amalgamate C source and header files."
+    usage = " ".join([
+        "amalgamate.py",
+        "[-v]",
+        "-c path/to/config.json",
+        "-s path/to/source/dir",
+        "[-p path/to/prologue.(c|h)]"
+    ])
+    argsparser = argparse.ArgumentParser(
+        description=description, usage=usage)
+
+    argsparser.add_argument("-v", "--verbose", dest="verbose",
+                            choices=["yes", "no"], metavar="", help="be verbose")
+
+    argsparser.add_argument("-c", "--config", dest="config",
+                            required=True, metavar="", help="path to a JSON config file")
+
+    argsparser.add_argument("-s", "--source", dest="source_path",
+                            required=True, metavar="", help="source code path")
+
+    argsparser.add_argument("-p", "--prologue", dest="prologue",
+                            required=False, metavar="", help="path to a C prologue file")
+
+    amalgamation = Amalgamation(argsparser.parse_args())
+    amalgamation.generate()
+
+
+if __name__ == "__main__":
+    main()
--- a/external/entt/entt/scripts/config.json
+++ b/external/entt/entt/scripts/config.json
@ -0,0 +1,8 @@
+{
+	"project": "entt",
+	"target": "single_include/entt/entt.hpp",
+	"sources": [
+		"src/entt/entt.hpp"
+	],
+	"include_paths": ["src"]
+}
--- a/external/entt/entt/scripts/update_homebrew.sh
+++ b/external/entt/entt/scripts/update_homebrew.sh
@ -0,0 +1,60 @@
+#!/bin/sh
+
+# only argument should be the version to upgrade to
+if [ $# != 1 ]
+then
+  echo "Expected a version tag like v2.7.1"
+  exit 1
+fi
+
+VERSION="$1"
+URL="https://github.com/skypjack/entt/archive/$VERSION.tar.gz"
+FORMULA="entt.rb"
+
+echo "Updating homebrew package to $VERSION"
+
+echo "Cloning..."
+git clone https://github.com/skypjack/homebrew-entt.git
+if [ $? != 0 ]
+then
+  exit 1
+fi
+cd homebrew-entt
+
+# download the repo at the version
+# exit with error messages if curl fails
+echo "Curling..."
+curl "$URL" --location --fail --silent --show-error --output archive.tar.gz
+if [ $? != 0 ]
+then
+  exit 1
+fi
+
+# compute sha256 hash
+echo "Hashing..."
+HASH="$(openssl sha256 archive.tar.gz | cut -d " " -f 2)"
+
+# delete the archive
+rm archive.tar.gz
+
+echo "Sedding..."
+
+# change the url in the formula file
+# the slashes in the URL must be escaped
+ESCAPED_URL="$(echo "$URL" | sed -e 's/[\/&]/\\&/g')"
+sed -i -e '/url/s/".*"/"'$ESCAPED_URL'"/' $FORMULA
+
+# change the hash in the formula file
+sed -i -e '/sha256/s/".*"/"'$HASH'"/' $FORMULA
+
+# delete temporary file created by sed
+rm -rf "$FORMULA-e"
+
+# update remote repo
+echo "Gitting..."
+git add entt.rb
+git commit -m "Update to $VERSION"
+git push origin master
+
+# out of homebrew-entt dir
+cd ..
--- a/external/entt/entt/single_include/entt/entt.hpp
+++ b/external/entt/entt/single_include/entt/entt.hpp
--- a/external/entt/entt/src/entt/config/config.h
+++ b/external/entt/entt/src/entt/config/config.h
@ -0,0 +1,81 @@
+#ifndef ENTT_CONFIG_CONFIG_H
+#define ENTT_CONFIG_CONFIG_H
+
+#include "version.h"
+
+#if defined(__cpp_exceptions) && !defined(ENTT_NOEXCEPTION)
+#    define ENTT_CONSTEXPR
+#    define ENTT_THROW throw
+#    define ENTT_TRY try
+#    define ENTT_CATCH catch(...)
+#else
+#    define ENTT_CONSTEXPR constexpr // use only with throwing functions (waiting for C++20)
+#    define ENTT_THROW
+#    define ENTT_TRY if(true)
+#    define ENTT_CATCH if(false)
+#endif
+
+#ifdef ENTT_USE_ATOMIC
+#    include <atomic>
+#    define ENTT_MAYBE_ATOMIC(Type) std::atomic<Type>
+#else
+#    define ENTT_MAYBE_ATOMIC(Type) Type
+#endif
+
+#ifndef ENTT_ID_TYPE
+#    include <cstdint>
+#    define ENTT_ID_TYPE std::uint32_t
+#endif
+
+#ifndef ENTT_SPARSE_PAGE
+#    define ENTT_SPARSE_PAGE 4096
+#endif
+
+#ifndef ENTT_PACKED_PAGE
+#    define ENTT_PACKED_PAGE 1024
+#endif
+
+#ifdef ENTT_DISABLE_ASSERT
+#    undef ENTT_ASSERT
+#    define ENTT_ASSERT(condition, msg) (void(0))
+#elif !defined ENTT_ASSERT
+#    include <cassert>
+#    define ENTT_ASSERT(condition, msg) assert(condition)
+#endif
+
+#ifdef ENTT_DISABLE_ASSERT
+#    undef ENTT_ASSERT_CONSTEXPR
+#    define ENTT_ASSERT_CONSTEXPR(condition, msg) (void(0))
+#elif !defined ENTT_ASSERT_CONSTEXPR
+#    define ENTT_ASSERT_CONSTEXPR(condition, msg) ENTT_ASSERT(condition, msg)
+#endif
+
+#ifdef ENTT_NO_ETO
+#    define ENTT_ETO_TYPE(Type) void
+#else
+#    define ENTT_ETO_TYPE(Type) Type
+#endif
+
+#ifdef ENTT_STANDARD_CPP
+#    define ENTT_NONSTD false
+#else
+#    define ENTT_NONSTD true
+#    if defined __clang__ || defined __GNUC__
+#        define ENTT_PRETTY_FUNCTION __PRETTY_FUNCTION__
+#        define ENTT_PRETTY_FUNCTION_PREFIX '='
+#        define ENTT_PRETTY_FUNCTION_SUFFIX ']'
+#    elif defined _MSC_VER
+#        define ENTT_PRETTY_FUNCTION __FUNCSIG__
+#        define ENTT_PRETTY_FUNCTION_PREFIX '<'
+#        define ENTT_PRETTY_FUNCTION_SUFFIX '>'
+#    endif
+#endif
+
+#if defined _MSC_VER
+#    pragma detect_mismatch("entt.version", ENTT_VERSION)
+#    pragma detect_mismatch("entt.noexcept", ENTT_XSTR(ENTT_TRY))
+#    pragma detect_mismatch("entt.id", ENTT_XSTR(ENTT_ID_TYPE))
+#    pragma detect_mismatch("entt.nonstd", ENTT_XSTR(ENTT_NONSTD))
+#endif
+
+#endif
--- a/external/entt/entt/src/entt/config/macro.h
+++ b/external/entt/entt/src/entt/config/macro.h
@ -0,0 +1,7 @@
+#ifndef ENTT_CONFIG_MACRO_H
+#define ENTT_CONFIG_MACRO_H
+
+#define ENTT_STR(arg) #arg
+#define ENTT_XSTR(arg) ENTT_STR(arg)
+
+#endif
--- a/external/entt/entt/src/entt/config/version.h
+++ b/external/entt/entt/src/entt/config/version.h
@ -0,0 +1,14 @@
+#ifndef ENTT_CONFIG_VERSION_H
+#define ENTT_CONFIG_VERSION_H
+
+#include "macro.h"
+
+#define ENTT_VERSION_MAJOR 3
+#define ENTT_VERSION_MINOR 11
+#define ENTT_VERSION_PATCH 1
+
+#define ENTT_VERSION \
+    ENTT_XSTR(ENTT_VERSION_MAJOR) \
+    "." ENTT_XSTR(ENTT_VERSION_MINOR) "." ENTT_XSTR(ENTT_VERSION_PATCH)
+
+#endif
--- a/external/entt/entt/src/entt/container/dense_map.hpp
+++ b/external/entt/entt/src/entt/container/dense_map.hpp
--- a/external/entt/entt/src/entt/container/dense_set.hpp
+++ b/external/entt/entt/src/entt/container/dense_set.hpp
@ -0,0 +1,895 @@
+#ifndef ENTT_CONTAINER_DENSE_SET_HPP
+#define ENTT_CONTAINER_DENSE_SET_HPP
+
+#include <cmath>
+#include <cstddef>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include <vector>
+#include "../config/config.h"
+#include "../core/compressed_pair.hpp"
+#include "../core/memory.hpp"
+#include "../core/type_traits.hpp"
+#include "fwd.hpp"
+
+namespace entt {
+
+/**
+ * @cond TURN_OFF_DOXYGEN
+ * Internal details not to be documented.
+ */
+
+namespace internal {
+
+template<typename It>
+class dense_set_iterator final {
+    template<typename>
+    friend class dense_set_iterator;
+
+public:
+    using value_type = typename It::value_type::second_type;
+    using pointer = const value_type *;
+    using reference = const value_type &;
+    using difference_type = std::ptrdiff_t;
+    using iterator_category = std::random_access_iterator_tag;
+
+    constexpr dense_set_iterator() noexcept
+        : it{} {}
+
+    constexpr dense_set_iterator(const It iter) noexcept
+        : it{iter} {}
+
+    template<typename Other, typename = std::enable_if_t<!std::is_same_v<It, Other> && std::is_constructible_v<It, Other>>>
+    constexpr dense_set_iterator(const dense_set_iterator<Other> &other) noexcept
+        : it{other.it} {}
+
+    constexpr dense_set_iterator &operator++() noexcept {
+        return ++it, *this;
+    }
+
+    constexpr dense_set_iterator operator++(int) noexcept {
+        dense_set_iterator orig = *this;
+        return ++(*this), orig;
+    }
+
+    constexpr dense_set_iterator &operator--() noexcept {
+        return --it, *this;
+    }
+
+    constexpr dense_set_iterator operator--(int) noexcept {
+        dense_set_iterator orig = *this;
+        return operator--(), orig;
+    }
+
+    constexpr dense_set_iterator &operator+=(const difference_type value) noexcept {
+        it += value;
+        return *this;
+    }
+
+    constexpr dense_set_iterator operator+(const difference_type value) const noexcept {
+        dense_set_iterator copy = *this;
+        return (copy += value);
+    }
+
+    constexpr dense_set_iterator &operator-=(const difference_type value) noexcept {
+        return (*this += -value);
+    }
+
+    constexpr dense_set_iterator operator-(const difference_type value) const noexcept {
+        return (*this + -value);
+    }
+
+    [[nodiscard]] constexpr reference operator[](const difference_type value) const noexcept {
+        return it[value].second;
+    }
+
+    [[nodiscard]] constexpr pointer operator->() const noexcept {
+        return std::addressof(it->second);
+    }
+
+    [[nodiscard]] constexpr reference operator*() const noexcept {
+        return *operator->();
+    }
+
+    template<typename ILhs, typename IRhs>
+    friend constexpr std::ptrdiff_t operator-(const dense_set_iterator<ILhs> &, const dense_set_iterator<IRhs> &) noexcept;
+
+    template<typename ILhs, typename IRhs>
+    friend constexpr bool operator==(const dense_set_iterator<ILhs> &, const dense_set_iterator<IRhs> &) noexcept;
+
+    template<typename ILhs, typename IRhs>
+    friend constexpr bool operator<(const dense_set_iterator<ILhs> &, const dense_set_iterator<IRhs> &) noexcept;
+
+private:
+    It it;
+};
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr std::ptrdiff_t operator-(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return lhs.it - rhs.it;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator==(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return lhs.it == rhs.it;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator!=(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return !(lhs == rhs);
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator<(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return lhs.it < rhs.it;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator>(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return rhs < lhs;
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator<=(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return !(lhs > rhs);
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator>=(const dense_set_iterator<ILhs> &lhs, const dense_set_iterator<IRhs> &rhs) noexcept {
+    return !(lhs < rhs);
+}
+
+template<typename It>
+class dense_set_local_iterator final {
+    template<typename>
+    friend class dense_set_local_iterator;
+
+public:
+    using value_type = typename It::value_type::second_type;
+    using pointer = const value_type *;
+    using reference = const value_type &;
+    using difference_type = std::ptrdiff_t;
+    using iterator_category = std::forward_iterator_tag;
+
+    constexpr dense_set_local_iterator() noexcept
+        : it{},
+          offset{} {}
+
+    constexpr dense_set_local_iterator(It iter, const std::size_t pos) noexcept
+        : it{iter},
+          offset{pos} {}
+
+    template<typename Other, typename = std::enable_if_t<!std::is_same_v<It, Other> && std::is_constructible_v<It, Other>>>
+    constexpr dense_set_local_iterator(const dense_set_local_iterator<Other> &other) noexcept
+        : it{other.it},
+          offset{other.offset} {}
+
+    constexpr dense_set_local_iterator &operator++() noexcept {
+        return offset = it[offset].first, *this;
+    }
+
+    constexpr dense_set_local_iterator operator++(int) noexcept {
+        dense_set_local_iterator orig = *this;
+        return ++(*this), orig;
+    }
+
+    [[nodiscard]] constexpr pointer operator->() const noexcept {
+        return std::addressof(it[offset].second);
+    }
+
+    [[nodiscard]] constexpr reference operator*() const noexcept {
+        return *operator->();
+    }
+
+    [[nodiscard]] constexpr std::size_t index() const noexcept {
+        return offset;
+    }
+
+private:
+    It it;
+    std::size_t offset;
+};
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator==(const dense_set_local_iterator<ILhs> &lhs, const dense_set_local_iterator<IRhs> &rhs) noexcept {
+    return lhs.index() == rhs.index();
+}
+
+template<typename ILhs, typename IRhs>
+[[nodiscard]] constexpr bool operator!=(const dense_set_local_iterator<ILhs> &lhs, const dense_set_local_iterator<IRhs> &rhs) noexcept {
+    return !(lhs == rhs);
+}
+
+} // namespace internal
+
+/**
+ * Internal details not to be documented.
+ * @endcond
+ */
+
+/**
+ * @brief Associative container for unique objects of a given type.
+ *
+ * Internally, elements are organized into buckets. Which bucket an element is
+ * placed into depends entirely on its hash. Elements with the same hash code
+ * appear in the same bucket.
+ *
+ * @tparam Type Value type of the associative container.
+ * @tparam Hash Type of function to use to hash the values.
+ * @tparam KeyEqual Type of function to use to compare the values for equality.
+ * @tparam Allocator Type of allocator used to manage memory and elements.
+ */
+template<typename Type, typename Hash, typename KeyEqual, typename Allocator>
+class dense_set {
+    static constexpr float default_threshold = 0.875f;
+    static constexpr std::size_t minimum_capacity = 8u;
+
+    using node_type = std::pair<std::size_t, Type>;
+    using alloc_traits = std::allocator_traits<Allocator>;
+    static_assert(std::is_same_v<typename alloc_traits::value_type, Type>, "Invalid value type");
+    using sparse_container_type = std::vector<std::size_t, typename alloc_traits::template rebind_alloc<std::size_t>>;
+    using packed_container_type = std::vector<node_type, typename alloc_traits::template rebind_alloc<node_type>>;
+
+    template<typename Other>
+    [[nodiscard]] std::size_t value_to_bucket(const Other &value) const noexcept {
+        return fast_mod(static_cast<size_type>(sparse.second()(value)), bucket_count());
+    }
+
+    template<typename Other>
+    [[nodiscard]] auto constrained_find(const Other &value, std::size_t bucket) {
+        for(auto it = begin(bucket), last = end(bucket); it != last; ++it) {
+            if(packed.second()(*it, value)) {
+                return begin() + static_cast<typename iterator::difference_type>(it.index());
+            }
+        }
+
+        return end();
+    }
+
+    template<typename Other>
+    [[nodiscard]] auto constrained_find(const Other &value, std::size_t bucket) const {
+        for(auto it = cbegin(bucket), last = cend(bucket); it != last; ++it) {
+            if(packed.second()(*it, value)) {
+                return cbegin() + static_cast<typename iterator::difference_type>(it.index());
+            }
+        }
+
+        return cend();
+    }
+
+    template<typename Other>
+    [[nodiscard]] auto insert_or_do_nothing(Other &&value) {
+        const auto index = value_to_bucket(value);
+
+        if(auto it = constrained_find(value, index); it != end()) {
+            return std::make_pair(it, false);
+        }
+
+        packed.first().emplace_back(sparse.first()[index], std::forward<Other>(value));
+        sparse.first()[index] = packed.first().size() - 1u;
+        rehash_if_required();
+
+        return std::make_pair(--end(), true);
+    }
+
+    void move_and_pop(const std::size_t pos) {
+        if(const auto last = size() - 1u; pos != last) {
+            size_type *curr = sparse.first().data() + value_to_bucket(packed.first().back().second);
+            packed.first()[pos] = std::move(packed.first().back());
+            for(; *curr != last; curr = &packed.first()[*curr].first) {}
+            *curr = pos;
+        }
+
+        packed.first().pop_back();
+    }
+
+    void rehash_if_required() {
+        if(size() > (bucket_count() * max_load_factor())) {
+            rehash(bucket_count() * 2u);
+        }
+    }
+
+public:
+    /*! @brief Key type of the container. */
+    using key_type = Type;
+    /*! @brief Value type of the container. */
+    using value_type = Type;
+    /*! @brief Unsigned integer type. */
+    using size_type = std::size_t;
+    /*! @brief Type of function to use to hash the elements. */
+    using hasher = Hash;
+    /*! @brief Type of function to use to compare the elements for equality. */
+    using key_equal = KeyEqual;
+    /*! @brief Allocator type. */
+    using allocator_type = Allocator;
+    /*! @brief Random access iterator type. */
+    using iterator = internal::dense_set_iterator<typename packed_container_type::iterator>;
+    /*! @brief Constant random access iterator type. */
+    using const_iterator = internal::dense_set_iterator<typename packed_container_type::const_iterator>;
+    /*! @brief Forward iterator type. */
+    using local_iterator = internal::dense_set_local_iterator<typename packed_container_type::iterator>;
+    /*! @brief Constant forward iterator type. */
+    using const_local_iterator = internal::dense_set_local_iterator<typename packed_container_type::const_iterator>;
+
+    /*! @brief Default constructor. */
+    dense_set()
+        : dense_set{minimum_capacity} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator.
+     * @param allocator The allocator to use.
+     */
+    explicit dense_set(const allocator_type &allocator)
+        : dense_set{minimum_capacity, hasher{}, key_equal{}, allocator} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator and user
+     * supplied minimal number of buckets.
+     * @param cnt Minimal number of buckets.
+     * @param allocator The allocator to use.
+     */
+    dense_set(const size_type cnt, const allocator_type &allocator)
+        : dense_set{cnt, hasher{}, key_equal{}, allocator} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator, hash
+     * function and user supplied minimal number of buckets.
+     * @param cnt Minimal number of buckets.
+     * @param hash Hash function to use.
+     * @param allocator The allocator to use.
+     */
+    dense_set(const size_type cnt, const hasher &hash, const allocator_type &allocator)
+        : dense_set{cnt, hash, key_equal{}, allocator} {}
+
+    /**
+     * @brief Constructs an empty container with a given allocator, hash
+     * function, compare function and user supplied minimal number of buckets.
+     * @param cnt Minimal number of buckets.
+     * @param hash Hash function to use.
+     * @param equal Compare function to use.
+     * @param allocator The allocator to use.
+     */
+    explicit dense_set(const size_type cnt, const hasher &hash = hasher{}, const key_equal &equal = key_equal{}, const allocator_type &allocator = allocator_type{})
+        : sparse{allocator, hash},
+          packed{allocator, equal},
+          threshold{default_threshold} {
+        rehash(cnt);
+    }
+
+    /*! @brief Default copy constructor. */
+    dense_set(const dense_set &) = default;
+
+    /**
+     * @brief Allocator-extended copy constructor.
+     * @param other The instance to copy from.
+     * @param allocator The allocator to use.
+     */
+    dense_set(const dense_set &other, const allocator_type &allocator)
+        : sparse{std::piecewise_construct, std::forward_as_tuple(other.sparse.first(), allocator), std::forward_as_tuple(other.sparse.second())},
+          packed{std::piecewise_construct, std::forward_as_tuple(other.packed.first(), allocator), std::forward_as_tuple(other.packed.second())},
+          threshold{other.threshold} {}
+
+    /*! @brief Default move constructor. */
+    dense_set(dense_set &&) noexcept(std::is_nothrow_move_constructible_v<compressed_pair<sparse_container_type, hasher>> &&std::is_nothrow_move_constructible_v<compressed_pair<packed_container_type, key_equal>>) = default;
+
+    /**
+     * @brief Allocator-extended move constructor.
+     * @param other The instance to move from.
+     * @param allocator The allocator to use.
+     */
+    dense_set(dense_set &&other, const allocator_type &allocator)
+        : sparse{std::piecewise_construct, std::forward_as_tuple(std::move(other.sparse.first()), allocator), std::forward_as_tuple(std::move(other.sparse.second()))},
+          packed{std::piecewise_construct, std::forward_as_tuple(std::move(other.packed.first()), allocator), std::forward_as_tuple(std::move(other.packed.second()))},
+          threshold{other.threshold} {}
+
+    /**
+     * @brief Default copy assignment operator.
+     * @return This container.
+     */
+    dense_set &operator=(const dense_set &) = default;
+
+    /**
+     * @brief Default move assignment operator.
+     * @return This container.
+     */
+    dense_set &operator=(dense_set &&) noexcept(std::is_nothrow_move_assignable_v<compressed_pair<sparse_container_type, hasher>> &&std::is_nothrow_move_assignable_v<compressed_pair<packed_container_type, key_equal>>) = default;
+
+    /**
+     * @brief Returns the associated allocator.
+     * @return The associated allocator.
+     */
+    [[nodiscard]] constexpr allocator_type get_allocator() const noexcept {
+        return sparse.first().get_allocator();
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning.
+     *
+     * The returned iterator points to the first instance of the internal array.
+     * If the array is empty, the returned iterator will be equal to `end()`.
+     *
+     * @return An iterator to the first instance of the internal array.
+     */
+    [[nodiscard]] const_iterator cbegin() const noexcept {
+        return packed.first().begin();
+    }
+
+    /*! @copydoc cbegin */
+    [[nodiscard]] const_iterator begin() const noexcept {
+        return cbegin();
+    }
+
+    /*! @copydoc begin */
+    [[nodiscard]] iterator begin() noexcept {
+        return packed.first().begin();
+    }
+
+    /**
+     * @brief Returns an iterator to the end.
+     *
+     * The returned iterator points to the element following the last instance
+     * of the internal array. Attempting to dereference the returned iterator
+     * results in undefined behavior.
+     *
+     * @return An iterator to the element following the last instance of the
+     * internal array.
+     */
+    [[nodiscard]] const_iterator cend() const noexcept {
+        return packed.first().end();
+    }
+
+    /*! @copydoc cend */
+    [[nodiscard]] const_iterator end() const noexcept {
+        return cend();
+    }
+
+    /*! @copydoc end */
+    [[nodiscard]] iterator end() noexcept {
+        return packed.first().end();
+    }
+
+    /**
+     * @brief Checks whether a container is empty.
+     * @return True if the container is empty, false otherwise.
+     */
+    [[nodiscard]] bool empty() const noexcept {
+        return packed.first().empty();
+    }
+
+    /**
+     * @brief Returns the number of elements in a container.
+     * @return Number of elements in a container.
+     */
+    [[nodiscard]] size_type size() const noexcept {
+        return packed.first().size();
+    }
+
+    /**
+     * @brief Returns the maximum possible number of elements.
+     * @return Maximum possible number of elements.
+     */
+    [[nodiscard]] size_type max_size() const noexcept {
+        return packed.first().max_size();
+    }
+
+    /*! @brief Clears the container. */
+    void clear() noexcept {
+        sparse.first().clear();
+        packed.first().clear();
+        rehash(0u);
+    }
+
+    /**
+     * @brief Inserts an element into the container, if it does not exist.
+     * @param value An element to insert into the container.
+     * @return A pair consisting of an iterator to the inserted element (or to
+     * the element that prevented the insertion) and a bool denoting whether the
+     * insertion took place.
+     */
+    std::pair<iterator, bool> insert(const value_type &value) {
+        return insert_or_do_nothing(value);
+    }
+
+    /*! @copydoc insert */
+    std::pair<iterator, bool> insert(value_type &&value) {
+        return insert_or_do_nothing(std::move(value));
+    }
+
+    /**
+     * @brief Inserts elements into the container, if they do not exist.
+     * @tparam It Type of input iterator.
+     * @param first An iterator to the first element of the range of elements.
+     * @param last An iterator past the last element of the range of elements.
+     */
+    template<typename It>
+    void insert(It first, It last) {
+        for(; first != last; ++first) {
+            insert(*first);
+        }
+    }
+
+    /**
+     * @brief Constructs an element in-place, if it does not exist.
+     *
+     * The element is also constructed when the container already has the key,
+     * in which case the newly constructed object is destroyed immediately.
+     *
+     * @tparam Args Types of arguments to forward to the constructor of the
+     * element.
+     * @param args Arguments to forward to the constructor of the element.
+     * @return A pair consisting of an iterator to the inserted element (or to
+     * the element that prevented the insertion) and a bool denoting whether the
+     * insertion took place.
+     */
+    template<typename... Args>
+    std::pair<iterator, bool> emplace(Args &&...args) {
+        if constexpr(((sizeof...(Args) == 1u) && ... && std::is_same_v<std::decay_t<Args>, value_type>)) {
+            return insert_or_do_nothing(std::forward<Args>(args)...);
+        } else {
+            auto &node = packed.first().emplace_back(std::piecewise_construct, std::make_tuple(packed.first().size()), std::forward_as_tuple(std::forward<Args>(args)...));
+            const auto index = value_to_bucket(node.second);
+
+            if(auto it = constrained_find(node.second, index); it != end()) {
+                packed.first().pop_back();
+                return std::make_pair(it, false);
+            }
+
+            std::swap(node.first, sparse.first()[index]);
+            rehash_if_required();
+
+            return std::make_pair(--end(), true);
+        }
+    }
+
+    /**
+     * @brief Removes an element from a given position.
+     * @param pos An iterator to the element to remove.
+     * @return An iterator following the removed element.
+     */
+    iterator erase(const_iterator pos) {
+        const auto diff = pos - cbegin();
+        erase(*pos);
+        return begin() + diff;
+    }
+
+    /**
+     * @brief Removes the given elements from a container.
+     * @param first An iterator to the first element of the range of elements.
+     * @param last An iterator past the last element of the range of elements.
+     * @return An iterator following the last removed element.
+     */
+    iterator erase(const_iterator first, const_iterator last) {
+        const auto dist = first - cbegin();
+
+        for(auto from = last - cbegin(); from != dist; --from) {
+            erase(packed.first()[from - 1u].second);
+        }
+
+        return (begin() + dist);
+    }
+
+    /**
+     * @brief Removes the element associated with a given value.
+     * @param value Value of an element to remove.
+     * @return Number of elements removed (either 0 or 1).
+     */
+    size_type erase(const value_type &value) {
+        for(size_type *curr = sparse.first().data() + value_to_bucket(value); *curr != (std::numeric_limits<size_type>::max)(); curr = &packed.first()[*curr].first) {
+            if(packed.second()(packed.first()[*curr].second, value)) {
+                const auto index = *curr;
+                *curr = packed.first()[*curr].first;
+                move_and_pop(index);
+                return 1u;
+            }
+        }
+
+        return 0u;
+    }
+
+    /**
+     * @brief Exchanges the contents with those of a given container.
+     * @param other Container to exchange the content with.
+     */
+    void swap(dense_set &other) {
+        using std::swap;
+        swap(sparse, other.sparse);
+        swap(packed, other.packed);
+        swap(threshold, other.threshold);
+    }
+
+    /**
+     * @brief Returns the number of elements matching a value (either 1 or 0).
+     * @param key Key value of an element to search for.
+     * @return Number of elements matching the key (either 1 or 0).
+     */
+    [[nodiscard]] size_type count(const value_type &key) const {
+        return find(key) != end();
+    }
+
+    /**
+     * @brief Returns the number of elements matching a key (either 1 or 0).
+     * @tparam Other Type of the key value of an element to search for.
+     * @param key Key value of an element to search for.
+     * @return Number of elements matching the key (either 1 or 0).
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, size_type>>
+    count(const Other &key) const {
+        return find(key) != end();
+    }
+
+    /**
+     * @brief Finds an element with a given value.
+     * @param value Value of an element to search for.
+     * @return An iterator to an element with the given value. If no such
+     * element is found, a past-the-end iterator is returned.
+     */
+    [[nodiscard]] iterator find(const value_type &value) {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /*! @copydoc find */
+    [[nodiscard]] const_iterator find(const value_type &value) const {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /**
+     * @brief Finds an element that compares _equivalent_ to a given value.
+     * @tparam Other Type of an element to search for.
+     * @param value Value of an element to search for.
+     * @return An iterator to an element with the given value. If no such
+     * element is found, a past-the-end iterator is returned.
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, iterator>>
+    find(const Other &value) {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /*! @copydoc find */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, const_iterator>>
+    find(const Other &value) const {
+        return constrained_find(value, value_to_bucket(value));
+    }
+
+    /**
+     * @brief Returns a range containing all elements with a given value.
+     * @param value Value of an element to search for.
+     * @return A pair of iterators pointing to the first element and past the
+     * last element of the range.
+     */
+    [[nodiscard]] std::pair<iterator, iterator> equal_range(const value_type &value) {
+        const auto it = find(value);
+        return {it, it + !(it == end())};
+    }
+
+    /*! @copydoc equal_range */
+    [[nodiscard]] std::pair<const_iterator, const_iterator> equal_range(const value_type &value) const {
+        const auto it = find(value);
+        return {it, it + !(it == cend())};
+    }
+
+    /**
+     * @brief Returns a range containing all elements that compare _equivalent_
+     * to a given value.
+     * @tparam Other Type of an element to search for.
+     * @param value Value of an element to search for.
+     * @return A pair of iterators pointing to the first element and past the
+     * last element of the range.
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, std::pair<iterator, iterator>>>
+    equal_range(const Other &value) {
+        const auto it = find(value);
+        return {it, it + !(it == end())};
+    }
+
+    /*! @copydoc equal_range */
+    template<class Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, std::pair<const_iterator, const_iterator>>>
+    equal_range(const Other &value) const {
+        const auto it = find(value);
+        return {it, it + !(it == cend())};
+    }
+
+    /**
+     * @brief Checks if the container contains an element with a given value.
+     * @param value Value of an element to search for.
+     * @return True if there is such an element, false otherwise.
+     */
+    [[nodiscard]] bool contains(const value_type &value) const {
+        return (find(value) != cend());
+    }
+
+    /**
+     * @brief Checks if the container contains an element that compares
+     * _equivalent_ to a given value.
+     * @tparam Other Type of an element to search for.
+     * @param value Value of an element to search for.
+     * @return True if there is such an element, false otherwise.
+     */
+    template<typename Other>
+    [[nodiscard]] std::enable_if_t<is_transparent_v<hasher> && is_transparent_v<key_equal>, std::conditional_t<false, Other, bool>>
+    contains(const Other &value) const {
+        return (find(value) != cend());
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the beginning of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator cbegin(const size_type index) const {
+        return {packed.first().begin(), sparse.first()[index]};
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the beginning of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator begin(const size_type index) const {
+        return cbegin(index);
+    }
+
+    /**
+     * @brief Returns an iterator to the beginning of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the beginning of the given bucket.
+     */
+    [[nodiscard]] local_iterator begin(const size_type index) {
+        return {packed.first().begin(), sparse.first()[index]};
+    }
+
+    /**
+     * @brief Returns an iterator to the end of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the end of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator cend([[maybe_unused]] const size_type index) const {
+        return {packed.first().begin(), (std::numeric_limits<size_type>::max)()};
+    }
+
+    /**
+     * @brief Returns an iterator to the end of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the end of the given bucket.
+     */
+    [[nodiscard]] const_local_iterator end(const size_type index) const {
+        return cend(index);
+    }
+
+    /**
+     * @brief Returns an iterator to the end of a given bucket.
+     * @param index An index of a bucket to access.
+     * @return An iterator to the end of the given bucket.
+     */
+    [[nodiscard]] local_iterator end([[maybe_unused]] const size_type index) {
+        return {packed.first().begin(), (std::numeric_limits<size_type>::max)()};
+    }
+
+    /**
+     * @brief Returns the number of buckets.
+     * @return The number of buckets.
+     */
+    [[nodiscard]] size_type bucket_count() const {
+        return sparse.first().size();
+    }
+
+    /**
+     * @brief Returns the maximum number of buckets.
+     * @return The maximum number of buckets.
+     */
+    [[nodiscard]] size_type max_bucket_count() const {
+        return sparse.first().max_size();
+    }
+
+    /**
+     * @brief Returns the number of elements in a given bucket.
+     * @param index The index of the bucket to examine.
+     * @return The number of elements in the given bucket.
+     */
+    [[nodiscard]] size_type bucket_size(const size_type index) const {
+        return static_cast<size_type>(std::distance(begin(index), end(index)));
+    }
+
+    /**
+     * @brief Returns the bucket for a given element.
+     * @param value The value of the element to examine.
+     * @return The bucket for the given element.
+     */
+    [[nodiscard]] size_type bucket(const value_type &value) const {
+        return value_to_bucket(value);
+    }
+
+    /**
+     * @brief Returns the average number of elements per bucket.
+     * @return The average number of elements per bucket.
+     */
+    [[nodiscard]] float load_factor() const {
+        return size() / static_cast<float>(bucket_count());
+    }
+
+    /**
+     * @brief Returns the maximum average number of elements per bucket.
+     * @return The maximum average number of elements per bucket.
+     */
+    [[nodiscard]] float max_load_factor() const {
+        return threshold;
+    }
+
+    /**
+     * @brief Sets the desired maximum average number of elements per bucket.
+     * @param value A desired maximum average number of elements per bucket.
+     */
+    void max_load_factor(const float value) {
+        ENTT_ASSERT(value > 0.f, "Invalid load factor");
+        threshold = value;
+        rehash(0u);
+    }
+
+    /**
+     * @brief Reserves at least the specified number of buckets and regenerates
+     * the hash table.
+     * @param cnt New number of buckets.
+     */
+    void rehash(const size_type cnt) {
+        auto value = cnt > minimum_capacity ? cnt : minimum_capacity;
+        const auto cap = static_cast<size_type>(size() / max_load_factor());
+        value = value > cap ? value : cap;
+
+        if(const auto sz = next_power_of_two(value); sz != bucket_count()) {
+            sparse.first().resize(sz);
+
+            for(auto &&elem: sparse.first()) {
+                elem = std::numeric_limits<size_type>::max();
+            }
+
+            for(size_type pos{}, last = size(); pos < last; ++pos) {
+                const auto index = value_to_bucket(packed.first()[pos].second);
+                packed.first()[pos].first = std::exchange(sparse.first()[index], pos);
+            }
+        }
+    }
+
+    /**
+     * @brief Reserves space for at least the specified number of elements and
+     * regenerates the hash table.
+     * @param cnt New number of elements.
+     */
+    void reserve(const size_type cnt) {
+        packed.first().reserve(cnt);
+        rehash(static_cast<size_type>(std::ceil(cnt / max_load_factor())));
+    }
+
+    /**
+     * @brief Returns the function used to hash the elements.
+     * @return The function used to hash the elements.
+     */
+    [[nodiscard]] hasher hash_function() const {
+        return sparse.second();
+    }
+
+    /**
+     * @brief Returns the function used to compare elements for equality.
+     * @return The function used to compare elements for equality.
+     */
+    [[nodiscard]] key_equal key_eq() const {
+        return packed.second();
+    }
+
+private:
+    compressed_pair<sparse_container_type, hasher> sparse;
+    compressed_pair<packed_container_type, key_equal> packed;
+    float threshold;
+};
+
+} // namespace entt
+
+#endif
--- a/external/entt/entt/src/entt/container/fwd.hpp
+++ b/external/entt/entt/src/entt/container/fwd.hpp
@ -0,0 +1,26 @@
+#ifndef ENTT_CONTAINER_FWD_HPP
+#define ENTT_CONTAINER_FWD_HPP
+
+#include <functional>
+#include <memory>
+
+namespace entt {
+
+template<
+    typename Key,
+    typename Type,
+    typename = std::hash<Key>,
+    typename = std::equal_to<Key>,
+    typename = std::allocator<std::pair<const Key, Type>>>
+class dense_map;
+
+template<
+    typename Type,
+    typename = std::hash<Type>,
+    typename = std::equal_to<Type>,
+    typename = std::allocator<Type>>
+class dense_set;
+
+} // namespace entt
+
+#endif
--- a/external/entt/entt/src/entt/core/algorithm.hpp
+++ b/external/entt/entt/src/entt/core/algorithm.hpp
@ -0,0 +1,137 @@
+#ifndef ENTT_CORE_ALGORITHM_HPP
+#define ENTT_CORE_ALGORITHM_HPP
+
+#include <algorithm>
+#include <functional>
+#include <iterator>
+#include <utility>
+#include <vector>
+#include "utility.hpp"
+
+namespace entt {
+
+/**
+ * @brief Function object to wrap `std::sort` in a class type.
+ *
+ * Unfortunately, `std::sort` cannot be passed as template argument to a class
+ * template or a function template.<br/>
+ * This class fills the gap by wrapping some flavors of `std::sort` in a
+ * function object.
+ */
+struct std_sort {
+    /**
+     * @brief Sorts the elements in a range.
+     *
+     * Sorts the elements in a range using the given binary comparison function.
+     *
+     * @tparam It Type of random access iterator.
+     * @tparam Compare Type of comparison function object.
+     * @tparam Args Types of arguments to forward to the sort function.
+     * @param first An iterator to the first element of the range to sort.
+     * @param last An iterator past the last element of the range to sort.
+     * @param compare A valid comparison function object.
+     * @param args Arguments to forward to the sort function, if any.
+     */
+    template<typename It, typename Compare = std::less<>, typename... Args>
+    void operator()(It first, It last, Compare compare = Compare{}, Args &&...args) const {
+        std::sort(std::forward<Args>(args)..., std::move(first), std::move(last), std::move(compare));
+    }
+};
+
+/*! @brief Function object for performing insertion sort. */
+struct insertion_sort {
+    /**
+     * @brief Sorts the elements in a range.
+     *
+     * Sorts the elements in a range using the given binary comparison function.
+     *
+     * @tparam It Type of random access iterator.
+     * @tparam Compare Type of comparison function object.
+     * @param first An iterator to the first element of the range to sort.
+     * @param last An iterator past the last element of the range to sort.
+     * @param compare A valid comparison function object.
+     */
+    template<typename It, typename Compare = std::less<>>
+    void operator()(It first, It last, Compare compare = Compare{}) const {
+        if(first < last) {
+            for(auto it = first + 1; it < last; ++it) {
+                auto value = std::move(*it);
+                auto pre = it;
+
+                for(; pre > first && compare(value, *(pre - 1)); --pre) {
+                    *pre = std::move(*(pre - 1));
+                }
+
+                *pre = std::move(value);
+            }
+        }
+    }
+};
+
+/**
+ * @brief Function object for performing LSD radix sort.
+ * @tparam Bit Number of bits processed per pass.
+ * @tparam N Maximum number of bits to sort.
+ */
+template<std::size_t Bit, std::size_t N>
+struct radix_sort {
+    static_assert((N % Bit) == 0, "The maximum number of bits to sort must be a multiple of the number of bits processed per pass");
+
+    /**
+     * @brief Sorts the elements in a range.
+     *
+     * Sorts the elements in a range using the given _getter_ to access the
+     * actual data to be sorted.
+     *
+     * This implementation is inspired by the online book
+     * [Physically Based Rendering](http://www.pbr-book.org/3ed-2018/Primitives_and_Intersection_Acceleration/Bounding_Volume_Hierarchies.html#RadixSort).
+     *
+     * @tparam It Type of random access iterator.
+     * @tparam Getter Type of _getter_ function object.
+     * @param first An iterator to the first element of the range to sort.
+     * @param last An iterator past the last element of the range to sort.
+     * @param getter A valid _getter_ function object.
+     */
+    template<typename It, typename Getter = identity>
+    void operator()(It first, It last, Getter getter = Getter{}) const {
+        if(first < last) {
+            static constexpr auto mask = (1 << Bit) - 1;
+            static constexpr auto buckets = 1 << Bit;
+            static constexpr auto passes = N / Bit;
+
+            using value_type = typename std::iterator_traits<It>::value_type;
+            std::vector<value_type> aux(std::distance(first, last));
+
+            auto part = [getter = std::move(getter)](auto from, auto to, auto out, auto start) {
+                std::size_t index[buckets]{};
+                std::size_t count[buckets]{};
+
+                for(auto it = from; it != to; ++it) {
+                    ++count[(getter(*it) >> start) & mask];
+                }
+
+                for(std::size_t pos{}, end = buckets - 1u; pos < end; ++pos) {
+                    index[pos + 1u] = index[pos] + count[pos];
+                }
+
+                for(auto it = from; it != to; ++it) {
+                    out[index[(getter(*it) >> start) & mask]++] = std::move(*it);
+                }
+            };
+
+            for(std::size_t pass = 0; pass < (passes & ~1); pass += 2) {
+                part(first, last, aux.begin(), pass * Bit);
+                part(aux.begin(), aux.end(), first, (pass + 1) * Bit);
+            }
+
+            if constexpr(passes & 1) {
+                part(first, last, aux.begin(), (passes - 1) * Bit);
+                std::move(aux.begin(), aux.end(), first);
+            }
+        }
+    }
+};
+
+} // namespace entt
+
+#endif
--- a/external/entt/entt/src/entt/core/any.hpp
+++ b/external/entt/entt/src/entt/core/any.hpp
@ -0,0 +1,510 @@
+#ifndef ENTT_CORE_ANY_HPP
+#define ENTT_CORE_ANY_HPP
+
+#include <cstddef>
+#include <memory>
+#include <type_traits>
+#include <utility>
+#include "../config/config.h"
+#include "../core/utility.hpp"
+#include "fwd.hpp"
+#include "type_info.hpp"
+#include "type_traits.hpp"
+
+namespace entt {
+
+/**
+ * @cond TURN_OFF_DOXYGEN
+ * Internal details not to be documented.
+ */
+
+namespace internal {
+
+enum class any_operation : std::uint8_t {
+    copy,
+    move,
+    transfer,
+    assign,
+    destroy,
+    compare,
+    get
+};
+
+enum class any_policy : std::uint8_t {
+    owner,
+    ref,
+    cref
+};
+
+} // namespace internal
+
+/**
+ * Internal details not to be documented.
+ * @endcond
+ */
+
+/**
+ * @brief A SBO friendly, type-safe container for single values of any type.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Optional alignment requirement.
+ */
+template<std::size_t Len, std::size_t Align>
+class basic_any {
+    using operation = internal::any_operation;
+    using policy = internal::any_policy;
+    using vtable_type = const void *(const operation, const basic_any &, const void *);
+
+    struct storage_type {
+        alignas(Align) std::byte data[Len + !Len];
+    };
+
+    template<typename Type>
+    static constexpr bool in_situ = Len && alignof(Type) <= Align && sizeof(Type) <= Len &&std::is_nothrow_move_constructible_v<Type>;
+
+    template<typename Type>
+    static const void *basic_vtable(const operation op, const basic_any &value, const void *other) {
+        static_assert(!std::is_same_v<Type, void> && std::is_same_v<std::remove_cv_t<std::remove_reference_t<Type>>, Type>, "Invalid type");
+        const Type *element = nullptr;
+
+        if constexpr(in_situ<Type>) {
+            element = value.owner() ? reinterpret_cast<const Type *>(&value.storage) : static_cast<const Type *>(value.instance);
+        } else {
+            element = static_cast<const Type *>(value.instance);
+        }
+
+        switch(op) {
+        case operation::copy:
+            if constexpr(std::is_copy_constructible_v<Type>) {
+                static_cast<basic_any *>(const_cast<void *>(other))->initialize<Type>(*element);
+            }
+            break;
+        case operation::move:
+            if constexpr(in_situ<Type>) {
+                if(value.owner()) {
+                    return new(&static_cast<basic_any *>(const_cast<void *>(other))->storage) Type{std::move(*const_cast<Type *>(element))};
+                }
+            }
+
+            return (static_cast<basic_any *>(const_cast<void *>(other))->instance = std::exchange(const_cast<basic_any &>(value).instance, nullptr));
+        case operation::transfer:
+            if constexpr(std::is_move_assignable_v<Type>) {
+                *const_cast<Type *>(element) = std::move(*static_cast<Type *>(const_cast<void *>(other)));
+                return other;
+            }
+            [[fallthrough]];
+        case operation::assign:
+            if constexpr(std::is_copy_assignable_v<Type>) {
+                *const_cast<Type *>(element) = *static_cast<const Type *>(other);
+                return other;
+            }
+            break;
+        case operation::destroy:
+            if constexpr(in_situ<Type>) {
+                element->~Type();
+            } else if constexpr(std::is_array_v<Type>) {
+                delete[] element;
+            } else {
+                delete element;
+            }
+            break;
+        case operation::compare:
+            if constexpr(!std::is_function_v<Type> && !std::is_array_v<Type> && is_equality_comparable_v<Type>) {
+                return *element == *static_cast<const Type *>(other) ? other : nullptr;
+            } else {
+                return (element == other) ? other : nullptr;
+            }
+        case operation::get:
+            return element;
+        }
+
+        return nullptr;
+    }
+
+    template<typename Type, typename... Args>
+    void initialize([[maybe_unused]] Args &&...args) {
+        info = &type_id<std::remove_cv_t<std::remove_reference_t<Type>>>();
+
+        if constexpr(!std::is_void_v<Type>) {
+            vtable = basic_vtable<std::remove_cv_t<std::remove_reference_t<Type>>>;
+
+            if constexpr(std::is_lvalue_reference_v<Type>) {
+                static_assert(sizeof...(Args) == 1u && (std::is_lvalue_reference_v<Args> && ...), "Invalid arguments");
+                mode = std::is_const_v<std::remove_reference_t<Type>> ? policy::cref : policy::ref;
+                instance = (std::addressof(args), ...);
+            } else if constexpr(in_situ<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+                if constexpr(sizeof...(Args) != 0u && std::is_aggregate_v<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+                    new(&storage) std::remove_cv_t<std::remove_reference_t<Type>>{std::forward<Args>(args)...};
+                } else {
+                    new(&storage) std::remove_cv_t<std::remove_reference_t<Type>>(std::forward<Args>(args)...);
+                }
+            } else {
+                if constexpr(sizeof...(Args) != 0u && std::is_aggregate_v<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+                    instance = new std::remove_cv_t<std::remove_reference_t<Type>>{std::forward<Args>(args)...};
+                } else {
+                    instance = new std::remove_cv_t<std::remove_reference_t<Type>>(std::forward<Args>(args)...);
+                }
+            }
+        }
+    }
+
+    basic_any(const basic_any &other, const policy pol) noexcept
+        : instance{other.data()},
+          info{other.info},
+          vtable{other.vtable},
+          mode{pol} {}
+
+public:
+    /*! @brief Size of the internal storage. */
+    static constexpr auto length = Len;
+    /*! @brief Alignment requirement. */
+    static constexpr auto alignment = Align;
+
+    /*! @brief Default constructor. */
+    constexpr basic_any() noexcept
+        : basic_any{std::in_place_type<void>} {}
+
+    /**
+     * @brief Constructs a wrapper by directly initializing the new object.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @tparam Args Types of arguments to use to construct the new instance.
+     * @param args Parameters to use to construct the instance.
+     */
+    template<typename Type, typename... Args>
+    explicit basic_any(std::in_place_type_t<Type>, Args &&...args)
+        : instance{},
+          info{},
+          vtable{},
+          mode{policy::owner} {
+        initialize<Type>(std::forward<Args>(args)...);
+    }
+
+    /**
+     * @brief Constructs a wrapper from a given value.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @param value An instance of an object to use to initialize the wrapper.
+     */
+    template<typename Type, typename = std::enable_if_t<!std::is_same_v<std::decay_t<Type>, basic_any>>>
+    basic_any(Type &&value)
+        : basic_any{std::in_place_type<std::decay_t<Type>>, std::forward<Type>(value)} {}
+
+    /**
+     * @brief Copy constructor.
+     * @param other The instance to copy from.
+     */
+    basic_any(const basic_any &other)
+        : basic_any{} {
+        if(other.vtable) {
+            other.vtable(operation::copy, other, this);
+        }
+    }
+
+    /**
+     * @brief Move constructor.
+     * @param other The instance to move from.
+     */
+    basic_any(basic_any &&other) noexcept
+        : instance{},
+          info{other.info},
+          vtable{other.vtable},
+          mode{other.mode} {
+        if(other.vtable) {
+            other.vtable(operation::move, other, this);
+        }
+    }
+
+    /*! @brief Frees the internal storage, whatever it means. */
+    ~basic_any() {
+        if(vtable && owner()) {
+            vtable(operation::destroy, *this, nullptr);
+        }
+    }
+
+    /**
+     * @brief Copy assignment operator.
+     * @param other The instance to copy from.
+     * @return This any object.
+     */
+    basic_any &operator=(const basic_any &other) {
+        reset();
+
+        if(other.vtable) {
+            other.vtable(operation::copy, other, this);
+        }
+
+        return *this;
+    }
+
+    /**
+     * @brief Move assignment operator.
+     * @param other The instance to move from.
+     * @return This any object.
+     */
+    basic_any &operator=(basic_any &&other) noexcept {
+        reset();
+
+        if(other.vtable) {
+            other.vtable(operation::move, other, this);
+            info = other.info;
+            vtable = other.vtable;
+            mode = other.mode;
+        }
+
+        return *this;
+    }
+
+    /**
+     * @brief Value assignment operator.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @param value An instance of an object to use to initialize the wrapper.
+     * @return This any object.
+     */
+    template<typename Type>
+    std::enable_if_t<!std::is_same_v<std::decay_t<Type>, basic_any>, basic_any &>
+    operator=(Type &&value) {
+        emplace<std::decay_t<Type>>(std::forward<Type>(value));
+        return *this;
+    }
+
+    /**
+     * @brief Returns the object type if any, `type_id<void>()` otherwise.
+     * @return The object type if any, `type_id<void>()` otherwise.
+     */
+    [[nodiscard]] const type_info &type() const noexcept {
+        return *info;
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] const void *data() const noexcept {
+        return vtable ? vtable(operation::get, *this, nullptr) : nullptr;
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @param req Expected type.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] const void *data(const type_info &req) const noexcept {
+        return *info == req ? data() : nullptr;
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] void *data() noexcept {
+        return mode == policy::cref ? nullptr : const_cast<void *>(std::as_const(*this).data());
+    }
+
+    /**
+     * @brief Returns an opaque pointer to the contained instance.
+     * @param req Expected type.
+     * @return An opaque pointer the contained instance, if any.
+     */
+    [[nodiscard]] void *data(const type_info &req) noexcept {
+        return mode == policy::cref ? nullptr : const_cast<void *>(std::as_const(*this).data(req));
+    }
+
+    /**
+     * @brief Replaces the contained object by creating a new instance directly.
+     * @tparam Type Type of object to use to initialize the wrapper.
+     * @tparam Args Types of arguments to use to construct the new instance.
+     * @param args Parameters to use to construct the instance.
+     */
+    template<typename Type, typename... Args>
+    void emplace(Args &&...args) {
+        reset();
+        initialize<Type>(std::forward<Args>(args)...);
+    }
+
+    /**
+     * @brief Assigns a value to the contained object without replacing it.
+     * @param other The value to assign to the contained object.
+     * @return True in case of success, false otherwise.
+     */
+    bool assign(const basic_any &other) {
+        if(vtable && mode != policy::cref && *info == *other.info) {
+            return (vtable(operation::assign, *this, other.data()) != nullptr);
+        }
+
+        return false;
+    }
+
+    /*! @copydoc assign */
+    bool assign(basic_any &&other) {
+        if(vtable && mode != policy::cref && *info == *other.info) {
+            if(auto *val = other.data(); val) {
+                return (vtable(operation::transfer, *this, val) != nullptr);
+            } else {
+                return (vtable(operation::assign, *this, std::as_const(other).data()) != nullptr);
+            }
+        }
+
+        return false;
+    }
+
+    /*! @brief Destroys contained object */
+    void reset() {
+        if(vtable && owner()) {
+            vtable(operation::destroy, *this, nullptr);
+        }
+
+        // unnecessary but it helps to detect nasty bugs
+        ENTT_ASSERT((instance = nullptr) == nullptr, "");
+        info = &type_id<void>();
+        vtable = nullptr;
+        mode = policy::owner;
+    }
+
+    /**
+     * @brief Returns false if a wrapper is empty, true otherwise.
+     * @return False if the wrapper is empty, true otherwise.
+     */
+    [[nodiscard]] explicit operator bool() const noexcept {
+        return vtable != nullptr;
+    }
+
+    /**
+     * @brief Checks if two wrappers differ in their content.
+     * @param other Wrapper with which to compare.
+     * @return False if the two objects differ in their content, true otherwise.
+     */
+    [[nodiscard]] bool operator==(const basic_any &other) const noexcept {
+        if(vtable && *info == *other.info) {
+            return (vtable(operation::compare, *this, other.data()) != nullptr);
+        }
+
+        return (!vtable && !other.vtable);
+    }
+
+    /**
+     * @brief Checks if two wrappers differ in their content.
+     * @param other Wrapper with which to compare.
+     * @return True if the two objects differ in their content, false otherwise.
+     */
+    [[nodiscard]] bool operator!=(const basic_any &other) const noexcept {
+        return !(*this == other);
+    }
+
+    /**
+     * @brief Aliasing constructor.
+     * @return A wrapper that shares a reference to an unmanaged object.
+     */
+    [[nodiscard]] basic_any as_ref() noexcept {
+        return basic_any{*this, (mode == policy::cref ? policy::cref : policy::ref)};
+    }
+
+    /*! @copydoc as_ref */
+    [[nodiscard]] basic_any as_ref() const noexcept {
+        return basic_any{*this, policy::cref};
+    }
+
+    /**
+     * @brief Returns true if a wrapper owns its object, false otherwise.
+     * @return True if the wrapper owns its object, false otherwise.
+     */
+    [[nodiscard]] bool owner() const noexcept {
+        return (mode == policy::owner);
+    }
+
+private:
+    union {
+        const void *instance;
+        storage_type storage;
+    };
+    const type_info *info;
+    vtable_type *vtable;
+    policy mode;
+};
+
+/**
+ * @brief Performs type-safe access to the contained object.
+ * @tparam Type Type to which conversion is required.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Alignment requirement.
+ * @param data Target any object.
+ * @return The element converted to the requested type.
+ */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type any_cast(const basic_any<Len, Align> &data) noexcept {
+    const auto *const instance = any_cast<std::remove_reference_t<Type>>(&data);
+    ENTT_ASSERT(instance, "Invalid instance");
+    return static_cast<Type>(*instance);
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type any_cast(basic_any<Len, Align> &data) noexcept {
+    // forces const on non-reference types to make them work also with wrappers for const references
+    auto *const instance = any_cast<std::remove_reference_t<const Type>>(&data);
+    ENTT_ASSERT(instance, "Invalid instance");
+    return static_cast<Type>(*instance);
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type any_cast(basic_any<Len, Align> &&data) noexcept {
+    if constexpr(std::is_copy_constructible_v<std::remove_cv_t<std::remove_reference_t<Type>>>) {
+        if(auto *const instance = any_cast<std::remove_reference_t<Type>>(&data); instance) {
+            return static_cast<Type>(std::move(*instance));
+        } else {
+            return any_cast<Type>(data);
+        }
+    } else {
+        auto *const instance = any_cast<std::remove_reference_t<Type>>(&data);
+        ENTT_ASSERT(instance, "Invalid instance");
+        return static_cast<Type>(std::move(*instance));
+    }
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+const Type *any_cast(const basic_any<Len, Align> *data) noexcept {
+    const auto &info = type_id<std::remove_cv_t<Type>>();
+    return static_cast<const Type *>(data->data(info));
+}
+
+/*! @copydoc any_cast */
+template<typename Type, std::size_t Len, std::size_t Align>
+Type *any_cast(basic_any<Len, Align> *data) noexcept {
+    if constexpr(std::is_const_v<Type>) {
+        // last attempt to make wrappers for const references return their values
+        return any_cast<Type>(&std::as_const(*data));
+    } else {
+        const auto &info = type_id<std::remove_cv_t<Type>>();
+        return static_cast<Type *>(data->data(info));
+    }
+}
+
+/**
+ * @brief Constructs a wrapper from a given type, passing it all arguments.
+ * @tparam Type Type of object to use to initialize the wrapper.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Optional alignment requirement.
+ * @tparam Args Types of arguments to use to construct the new instance.
+ * @param args Parameters to use to construct the instance.
+ * @return A properly initialized wrapper for an object of the given type.
+ */
+template<typename Type, std::size_t Len = basic_any<>::length, std::size_t Align = basic_any<Len>::alignment, typename... Args>
+basic_any<Len, Align> make_any(Args &&...args) {
+    return basic_any<Len, Align>{std::in_place_type<Type>, std::forward<Args>(args)...};
+}
+
+/**
+ * @brief Forwards its argument and avoids copies for lvalue references.
+ * @tparam Len Size of the storage reserved for the small buffer optimization.
+ * @tparam Align Optional alignment requirement.
+ * @tparam Type Type of argument to use to construct the new instance.
+ * @param value Parameter to use to construct the instance.
+ * @return A properly initialized and not necessarily owning wrapper.
+ */
+template<std::size_t Len = basic_any<>::length, std::size_t Align = basic_any<Len>::alignment, typename Type>
+basic_any<Len, Align> forward_as_any(Type &&value) {
+    return basic_any<Len, Align>{std::in_place_type<Type &&>, std::forward<Type>(value)};
+}
+
+} // namespace entt
+
+#endif
--- a/external/entt/entt/src/entt/core/attribute.h
+++ b/external/entt/entt/src/entt/core/attribute.h
@ -0,0 +1,30 @@
+#ifndef ENTT_CORE_ATTRIBUTE_H
+#define ENTT_CORE_ATTRIBUTE_H
+
+#ifndef ENTT_EXPORT
+#    if defined _WIN32 || defined __CYGWIN__ || defined _MSC_VER
+#        define ENTT_EXPORT __declspec(dllexport)
+#        define ENTT_IMPORT __declspec(dllimport)
+#        define ENTT_HIDDEN
+#    elif defined __GNUC__ && __GNUC__ >= 4
+#        define ENTT_EXPORT __attribute__((visibility("default")))
+#        define ENTT_IMPORT __attribute__((visibility("default")))
+#        define ENTT_HIDDEN __attribute__((visibility("hidden")))
+#    else /* Unsupported compiler */
+#        define ENTT_EXPORT
+#        define ENTT_IMPORT
+#        define ENTT_HIDDEN
+#    endif
+#endif
+
+#ifndef ENTT_API
+#    if defined ENTT_API_EXPORT
+#        define ENTT_API ENTT_EXPORT
+#    elif defined ENTT_API_IMPORT
+#        define ENTT_API ENTT_IMPORT
+#    else /* No API */
+#        define ENTT_API
+#    endif
+#endif
+
+#endif
--- a/external/entt/entt/src/entt/core/compressed_pair.hpp
+++ b/external/entt/entt/src/entt/core/compressed_pair.hpp
@ -0,0 +1,279 @@
+#ifndef ENTT_CORE_COMPRESSED_PAIR_HPP
+#define ENTT_CORE_COMPRESSED_PAIR_HPP
+
+#include <cstddef>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+#include "type_traits.hpp"
+
+namespace entt {
+
+/**
+ * @cond TURN_OFF_DOXYGEN
+ * Internal details not to be documented.
+ */
+
+namespace internal {
+
+template<typename Type, std::size_t, typename = void>
+struct compressed_pair_element {
+    using reference = Type &;
+    using const_reference = const Type &;
+
+    template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<Type>>>
+    constexpr compressed_pair_element() noexcept(std::is_nothrow_default_constructible_v<Type>)
+        : value{} {}
+
+    template<typename Arg, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Arg>>, compressed_pair_element>>>
+    constexpr compressed_pair_element(Arg &&arg) noexcept(std::is_nothrow_constructible_v<Type, Arg>)
+        : value{std::forward<Arg>(arg)} {}
+
+    template<typename... Args, std::size_t... Index>
+    constexpr compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>) noexcept(std::is_nothrow_constructible_v<Type, Args...>)
+        : value{std::forward<Args>(std::get<Index>(args))...} {}
+
+    [[nodiscard]] constexpr reference get() noexcept {
+        return value;
+    }
+
+    [[nodiscard]] constexpr const_reference get() const noexcept {
+        return value;
+    }
+
+private:
+    Type value;
+};
+
+template<typename Type, std::size_t Tag>
+struct compressed_pair_element<Type, Tag, std::enable_if_t<is_ebco_eligible_v<Type>>>: Type {
+    using reference = Type &;
+    using const_reference = const Type &;
+    using base_type = Type;
+
+    template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<base_type>>>
+    constexpr compressed_pair_element() noexcept(std::is_nothrow_default_constructible_v<base_type>)
+        : base_type{} {}
+
+    template<typename Arg, typename = std::enable_if_t<!std::is_same_v<std::remove_cv_t<std::remove_reference_t<Arg>>, compressed_pair_element>>>
+    constexpr compressed_pair_element(Arg &&arg) noexcept(std::is_nothrow_constructible_v<base_type, Arg>)
+        : base_type{std::forward<Arg>(arg)} {}
+
+    template<typename... Args, std::size_t... Index>
+    constexpr compressed_pair_element(std::tuple<Args...> args, std::index_sequence<Index...>) noexcept(std::is_nothrow_constructible_v<base_type, Args...>)
+        : base_type{std::forward<Args>(std::get<Index>(args))...} {}
+
+    [[nodiscard]] constexpr reference get() noexcept {
+        return *this;
+    }
+
+    [[nodiscard]] constexpr const_reference get() const noexcept {
+        return *this;
+    }
+};
+
+} // namespace internal
+
+/**
+ * Internal details not to be documented.
+ * @endcond
+ */
+
+/**
+ * @brief A compressed pair.
+ *
+ * A pair that exploits the _Empty Base Class Optimization_ (or _EBCO_) to
+ * reduce its final size to a minimum.
+ *
+ * @tparam First The type of the first element that the pair stores.
+ * @tparam Second The type of the second element that the pair stores.
+ */
+template<typename First, typename Second>
+class compressed_pair final
+    : internal::compressed_pair_element<First, 0u>,
+      internal::compressed_pair_element<Second, 1u> {
+    using first_base = internal::compressed_pair_element<First, 0u>;
+    using second_base = internal::compressed_pair_element<Second, 1u>;
+
+public:
+    /*! @brief The type of the first element that the pair stores. */
+    using first_type = First;
+    /*! @brief The type of the second element that the pair stores. */
+    using second_type = Second;
+
+    /**
+     * @brief Default constructor, conditionally enabled.
+     *
+     * This constructor is only available when the types that the pair stores
+     * are both at least default constructible.
+     *
+     * @tparam Dummy Dummy template parameter used for internal purposes.
+     */
+    template<bool Dummy = true, typename = std::enable_if_t<Dummy && std::is_default_constructible_v<first_type> && std::is_default_constructible_v<second_type>>>
+    constexpr compressed_pair() noexcept(std::is_nothrow_default_constructible_v<first_base> &&std::is_nothrow_default_constructible_v<second_base>)
+        : first_base{},
+          second_base{} {}
+
+    /**
+     * @brief Copy constructor.
+     * @param other The instance to copy from.
+     */
+    constexpr compressed_pair(const compressed_pair &other) noexcept(std::is_nothrow_copy_constructible_v<first_base> &&std::is_nothrow_copy_constructible_v<second_base>) = default;
+
+    /**
+     * @brief Move constructor.
+     * @param other The instance to move from.
+     */
+    constexpr compressed_pair(compressed_pair &&other) noexcept(std::is_nothrow_move_constructible_v<first_base> &&std::is_nothrow_move_constructible_v<second_base>) = default;
+
+    /**
+     * @brief Constructs a pair from its values.
+     * @tparam Arg Type of value to use to initialize the first element.
+     * @tparam Other Type of value to use to initialize the second element.
+     * @param arg Value to use to initialize the first element.
+     * @param other Value to use to initialize the second element.
+     */
+    template<typename Arg, typename Other>
+    constexpr compressed_pair(Arg &&arg, Other &&other) noexcept(std::is_nothrow_constructible_v<first_base, Arg> &&std::is_nothrow_constructible_v<second_base, Other>)
+        : first_base{std::forward<Arg>(arg)},
+          second_base{std::forward<Other>(other)} {}
+
+    /**
+     * @brief Constructs a pair by forwarding the arguments to its parts.
+     * @tparam Args Types of arguments to use to initialize the first element.
+     * @tparam Other Types of arguments to use to initialize the second element.
+     * @param args Arguments to use to initialize the first element.
+     * @param other Arguments to use to initialize the second element.
+     */
+    template<typename... Args, typename... Other>
+    constexpr compressed_pair(std::piecewise_construct_t, std::tuple<Args...> args, std::tuple<Other...> other) noexcept(std::is_nothrow_constructible_v<first_base, Args...> &&std::is_nothrow_constructible_v<second_base, Other...>)
+        : first_base{std::move(args), std::index_sequence_for<Args...>{}},
+          second_base{std::move(other), std::index_sequence_for<Other...>{}} {}
+
+    /**
+     * @brief Copy assignment operator.
+     * @param other The instance to copy from.
+     * @return This compressed pair object.
+     */
+    constexpr compressed_pair &operator=(const compressed_pair &other) noexcept(std::is_nothrow_copy_assignable_v<first_base> &&std::is_nothrow_copy_assignable_v<second_base>) = default;
+
+    /**
+     * @brief Move assignment operator.
+     * @param other The instance to move from.
+     * @return This compressed pair object.
+     */
+    constexpr compressed_pair &operator=(compressed_pair &&other) noexcept(std::is_nothrow_move_assignable_v<first_base> &&std::is_nothrow_move_assignable_v<second_base>) = default;
+
+    /**
+     * @brief Returns the first element that a pair stores.
+     * @return The first element that a pair stores.
+     */
+    [[nodiscard]] constexpr first_type &first() noexcept {
+        return static_cast<first_base &>(*this).get();
+    }
+
+    /*! @copydoc first */
+    [[nodiscard]] constexpr const first_type &first() const noexcept {
+        return static_cast<const first_base &>(*this).get();
+    }
+
+    /**
+     * @brief Returns the second element that a pair stores.
+     * @return The second element that a pair stores.
+     */
+    [[nodiscard]] constexpr second_type &second() noexcept {
+        return static_cast<second_base &>(*this).get();
+    }
+
+    /*! @copydoc second */
+    [[nodiscard]] constexpr const second_type &second() const noexcept {
+        return static_cast<const second_base &>(*this).get();
+    }
+
+    /**
+     * @brief Swaps two compressed pair objects.
+     * @param other The compressed pair to swap with.
+     */
+    constexpr void swap(compressed_pair &other) noexcept(std::is_nothrow_swappable_v<first_type> &&std::is_nothrow_swappable_v<second_type>) {
+        using std::swap;
+        swap(first(), other.first());
+        swap(second(), other.second());
+    }
+
+    /**
+     * @brief Extracts an element from the compressed pair.
+     * @tparam Index An integer value that is either 0 or 1.
+     * @return Returns a reference to the first element if `Index` is 0 and a
+     * reference to the second element if `Index` is 1.
+     */
+    template<std::size_t Index>
+    constexpr decltype(auto) get() noexcept {
+        if constexpr(Index == 0u) {
+            return first();
+        } else {
+            static_assert(Index == 1u, "Index out of bounds");
+            return second();
+        }
+    }
+
+    /*! @copydoc get */
+    template<std::size_t Index>
+    constexpr decltype(auto) get() const noexcept {
+        if constexpr(Index == 0u) {
+            return first();
+        } else {
+            static_assert(Index == 1u, "Index out of bounds");
+            return second();
+        }
+    }
+};
+
+/**
+ * @brief Deduction guide.
+ * @tparam Type Type of value to use to initialize the first element.
+ * @tparam Other Type of value to use to initialize the second element.
+ */
+template<typename Type, typename Other>
+compressed_pair(Type &&, Other &&) -> compressed_pair<std::decay_t<Type>, std::decay_t<Other>>;
+
+/**
+ * @brief Swaps two compressed pair objects.
+ * @tparam First The type of the first element that the pairs store.
+ * @tparam Second The type of the second element that the pairs store.
+ * @param lhs A valid compressed pair object.
+ * @param rhs A valid compressed pair object.
+ */
+template<typename First, typename Second>
+inline constexpr void swap(compressed_pair<First, Second> &lhs, compressed_pair<First, Second> &rhs) {
+    lhs.swap(rhs);
+}
+
+} // namespace entt
+
+// disable structured binding support for clang 6, it messes when specializing tuple_size
+#if !defined __clang_major__ || __clang_major__ > 6
+namespace std {
+
+/**
+ * @brief `std::tuple_size` specialization for `compressed_pair`s.
+ * @tparam First The type of the first element that the pair stores.
+ * @tparam Second The type of the second element that the pair stores.
+ */
+template<typename First, typename Second>
+struct tuple_size<entt::compressed_pair<First, Second>>: integral_constant<size_t, 2u> {};
+
+/**
+ * @brief `std::tuple_element` specialization for `compressed_pair`s.
+ * @tparam Index The index of the type to return.
+ * @tparam First The type of the first element that the pair stores.
+ * @tparam Second The type of the second element that the pair stores.
+ */
+template<size_t Index, typename First, typename Second>
+struct tuple_element<Index, entt::compressed_pair<First, Second>>: conditional<Index == 0u, First, Second> {
+    static_assert(Index < 2u, "Index out of bounds");
+};
+
+} // namespace std
+#endif
+
+#endif
--- a/external/entt/entt/src/entt/core/enum.hpp
+++ b/external/entt/entt/src/entt/core/enum.hpp
@ -0,0 +1,97 @@
+#ifndef ENTT_CORE_ENUM_HPP
+#define ENTT_CORE_ENUM_HPP
+
+#include <type_traits>
+
+namespace entt {
+
+/**
+ * @brief Enable bitmask support for enum classes.
+ * @tparam Type The enum type for which to enable bitmask support.
+ */
+template<typename Type, typename = void>
+struct enum_as_bitmask: std::false_type {};
+
+/*! @copydoc enum_as_bitmask */
+template<typename Type>
+struct enum_as_bitmask<Type, std::void_t<decltype(Type::_entt_enum_as_bitmask)>>: std::is_enum<Type> {};
+
+/**
+ * @brief Helper variable template.
+ * @tparam Type The enum class type for which to enable bitmask support.
+ */
+template<typename Type>
+inline constexpr bool enum_as_bitmask_v = enum_as_bitmask<Type>::value;
+
+} // namespace entt
+
+/**
+ * @brief Operator available for enums for which bitmask support is enabled.
+ * @tparam Type Enum class type.
+ * @param lhs The first value to use.
+ * @param rhs The second value to use.
+ * @return The result of invoking the operator on the underlying types of the
+ * two values provided.
+ */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator|(const Type lhs, const Type rhs) noexcept {
+    return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) | static_cast<std::underlying_type_t<Type>>(rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator&(const Type lhs, const Type rhs) noexcept {
+    return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) & static_cast<std::underlying_type_t<Type>>(rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator^(const Type lhs, const Type rhs) noexcept {
+    return static_cast<Type>(static_cast<std::underlying_type_t<Type>>(lhs) ^ static_cast<std::underlying_type_t<Type>>(rhs));
+}
+
+/**
+ * @brief Operator available for enums for which bitmask support is enabled.
+ * @tparam Type Enum class type.
+ * @param value The value to use.
+ * @return The result of invoking the operator on the underlying types of the
+ * value provided.
+ */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type>
+operator~(const Type value) noexcept {
+    return static_cast<Type>(~static_cast<std::underlying_type_t<Type>>(value));
+}
+
+/*! @copydoc operator~ */
+template<typename Type>
+[[nodiscard]] constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, bool>
+operator!(const Type value) noexcept {
+    return !static_cast<std::underlying_type_t<Type>>(value);
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
+operator|=(Type &lhs, const Type rhs) noexcept {
+    return (lhs = (lhs | rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
+operator&=(Type &lhs, const Type rhs) noexcept {
+    return (lhs = (lhs & rhs));
+}
+
+/*! @copydoc operator| */
+template<typename Type>
+constexpr std::enable_if_t<entt::enum_as_bitmask_v<Type>, Type &>
+operator^=(Type &lhs, const Type rhs) noexcept {
+    return (lhs = (lhs ^ rhs));
+}
+
+#endif
--- a/Show More
+++ b/Show More
				`@ -0,0 +1 @@`
				`workspace(name = "com_github_skypjack_entt")`