Squashed 'external/toxcore/c-toxcore/' changes from 3e05824b80..da438763d5

da438763d5 chore: Release 0.2.19
f90417987c chore: Add cmake flag to disable unit tests.
7df3f99417 docs: Document that group topic lock is default on.
9e9ed77390 docs: Add missing param docs for callbacks.
0ec4978de5 refactor: Don't expose Tox_System in the public API
a3d1b8595c docs: Public headers, Core/toxcore -> Tox/the Tox library
f78d0f3f39 docs: Public headers, events_alloc -> internal
817518949e docs: Public headers, NULL-terminated -> NUL-terminated
be085db191 docs: Public headers, spellcheck
4c902955f3 docs: Public headers, 80 column width comments
be8a82a818 docs: Public headers, null -> NULL
419d783d95 docs: Public headers, tox -> Tox
5c8aa65e41 docs: Update user data API explanation
ad4921dbaa cleanup: A more descriptive error for group invite accept function

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: da438763d5b8e071de6e061a1dcaddd2177dff7d

.cirrus.yml

@@ -7,13 +7,14 @@ bazel-opt_task:
   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 # TODO(robinlinden): Why does this pass locally but not in Cirrus?
+        -//c-toxcore/auto_tests:tcp_relay_test # Cirrus doesn't allow external network connections.
 
 bazel-dbg_task:
   container:
@@ -30,7 +31,7 @@ bazel-dbg_task:
         --remote_http_cache=http://$CIRRUS_HTTP_CACHE_HOST
         --
         //c-toxcore/...
-        -//c-toxcore/auto_tests:tcp_relay_test # TODO(robinlinden): Why does this pass locally but not in Cirrus?
+        -//c-toxcore/auto_tests:tcp_relay_test # Cirrus doesn't allow external network connections.
 
 cimple_task:
   container:
@@ -40,6 +41,7 @@ cimple_task:
   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
@@ -69,7 +71,7 @@ freebsd_task:
       cmake . \
         -DMIN_LOGGER_LEVEL=TRACE \
         -DMUST_BUILD_TOXAV=ON \
-        -DNON_HERMETIC_TESTS=ON \
+        -DNON_HERMETIC_TESTS=OFF \
         -DTEST_TIMEOUT_SECONDS=50 \
         -DUSE_IPV6=OFF \
         -DAUTOTEST=ON