Squashed 'external/toxcore/c-toxcore/' changes from 55752a2e2ef..11ab1d2a723

11ab1d2a723 fix: reduce memory usage in group chats by 75% Significantly reduced the memory usage of groups since all message slots are preallocated for every peer for send and receive buffers of buffer size (hundreds of MiB peak when save contained alot of peers to try to connect to)
4f09f4e147c chore: Fix tsan build by moving it to GitHub CI.
6460c25c9e0 refactor: Use `merge_sort` instead of `qsort` for sorting.
c660bbe8c95 test: Fix crypto_test to initialise its plain text buffer.
0204db6184b cleanup: Fix layering check warnings.
df2211e1548 refactor: Use tox memory allocator for temporary buffers in crypto.
ac812871a2e feat: implement the last 2 missing network struct functions and make use of them
29d1043be0b test: friend request test now tests min/max message sizes
93aafd78c1f fix: friend requests with very long messages are no longer dropped
819aa2b2618 feat: Add option to disable DNS lookups in toxcore.
0ac23cee035 fix: windows use of REUSEADDR
7d2811d302d chore(ci): make bazel server shutdown faster
1dc399ba20d chore: Use vcpkg instead of conan in the MSVC build.
14d823165d9 chore: Migrate to conan 2.
bdd17c16787 cleanup: Allocate logger using tox memory allocator.
b396c061515 chore(deps): bump third_party/cmp from `2ac6bca` to `52bfcfa`
2e94da60d09 feat(net): add missing connect to network struct
41fb1839c7b chore: Add check to ensure version numbers agree.
934a8301113 chore: Release 0.2.20
3acef4bf044 fix: Add missing free in dht_get_nodes_response event.

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 11ab1d2a7232eee19b51ce126ccce267d6578903

toxcore/tox.h

@@ -148,7 +148,7 @@ uint32_t tox_version_minor(void);
  * Incremented when bugfixes are applied without changing any functionality or
  * API or ABI.
  */
-#define TOX_VERSION_PATCH              19
+#define TOX_VERSION_PATCH              20
 
 uint32_t tox_version_patch(void);
 
@@ -274,7 +274,7 @@ uint32_t tox_max_status_message_length(void);
  *
  * @deprecated The macro will be removed in 0.3.0. Use the function instead.
  */
-#define TOX_MAX_FRIEND_REQUEST_LENGTH  1016
+#define TOX_MAX_FRIEND_REQUEST_LENGTH  921
 
 uint32_t tox_max_friend_request_length(void);
 
@@ -668,6 +668,24 @@ struct Tox_Options {
      * Default: false.
      */
     bool experimental_groups_persistence;
+
+    /**
+     * @brief Disable DNS hostname resolution.
+     *
+     * Hostnames or IP addresses are passed to the bootstrap/add_tcp_relay
+     * function and proxy host options. If disabled (this flag is true), only
+     * IP addresses are allowed.
+     *
+     * If this is set to true, the library will not attempt to resolve
+     * hostnames. This is useful for clients that want to resolve hostnames
+     * themselves and pass the resolved IP addresses to the library (e.g. in
+     * case it wants to use Tor).
+     * Passing hostnames will result in a TOX_ERR_BOOTSTRAP_BAD_HOST error if
+     * this is set to true.
+     *
+     * Default: false. May become true in the future (0.3.0).
+     */
+    bool experimental_disable_dns;
 };
 
 bool tox_options_get_ipv6_enabled(const Tox_Options *options);
@@ -742,6 +760,10 @@ bool tox_options_get_experimental_groups_persistence(const Tox_Options *options)
 
 void tox_options_set_experimental_groups_persistence(Tox_Options *options, bool experimental_groups_persistence);
 
+bool tox_options_get_experimental_disable_dns(const Tox_Options *options);
+
+void tox_options_set_experimental_disable_dns(Tox_Options *options, bool experimental_disable_dns);
+
 /**
  * @brief Initialises a Tox_Options object with the default options.
  *