Restyle feat: Merge group announce portion of new groupchats implementation

[restyled-io]

A duplicate of #2230 with additional commits that automatically address
incorrect style, created by Restyled.

Since the original Pull Request was opened as a fork in a contributor's
repository, we are unable to create a Pull Request branching from it with only
the style fixes.

The following Restylers made fixes:

• clang-format

To incorporate these changes, you can either:

1. Merge this Pull Request instead of the original, or

2. Ask your contributor to locally incorporate these commits and push them to
   the original Pull Request

   Expand for example instructions

   ```console
   git remote add upstream https://github.com/TokTok/c-toxcore.git
   git fetch upstream pull/<this PR number>/head
   git merge --ff-only FETCH_HEAD
   git push
   ```
   

NOTE: As work continues on the original Pull Request, this process will
re-run and update (force-push) this Pull Request with updated style fixes as
necessary. If the style is fixed manually at any point (i.e. this process finds
no fixes to make), this Pull Request will be closed automatically.

Sorry if this was unexpected. To disable it, see our documentation.

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This change is 

[codecov]

Codecov Report

Merging #2245 (98e6a94) into master (e3ace8c) will decrease coverage by 0.13%.
The diff coverage is 63.35%.

❗ Current head 98e6a94 differs from pull request most recent head 6d7db4c. Consider uploading reports for the commit 6d7db4c to get more accurate results

@@            Coverage Diff             @@
##           master    #2245      +/-   ##
==========================================
- Coverage   78.46%   78.32%   -0.14%     
==========================================
  Files         120      127       +7     
  Lines       22671    23875    +1204     
==========================================
+ Hits        17788    18700     +912     
- Misses       4883     5175     +292     

Impacted Files	Coverage Δ
toxcore/group_announce.c	50.23% <50.23%> (ø)
toxcore/group_announce_test.cc	98.73% <98.73%> (ø)
toxav/bwcontroller.c	38.55% <0.00%> (-7.23%)	⬇️
auto_tests/tox_many_test.c	98.18% <0.00%> (-1.82%)	⬇️
toxav/groupav.c	74.58% <0.00%> (-1.34%)	⬇️
toxcore/crypto_core.c	92.72% <0.00%> (-0.91%)	⬇️
toxcore/TCP_common.c	77.77% <0.00%> (-0.75%)	⬇️
toxcore/onion_announce.c	80.66% <0.00%> (-0.56%)	⬇️
toxcore/group.c	84.35% <0.00%> (-0.14%)	⬇️
toxcore/Messenger.c	82.90% <0.00%> (-0.13%)	⬇️
... and 17 more

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