v1.21.4

Fixes:
Prevent crash when selecting first infected (Mods#731)

Code refactoring:
Use .def for function exports (Launcher#625)
Use getrandom() instead of random int from player array (Mods#778)

Tooling:
Schedule the merge conflict labelling to run daily (Launcher#631)
Add cmake format check to CI (Launcher#630)

Contributors:
@ASpoonPlaysGames @GeckoEidechse