📚 Updated mod link in wallpapers README

Doxygen: documented class raceBuilder

Bump actions/checkout from 2.3.4 to 2.3.5 (#2813)

removed diag_physics_dt

autosave on exit

✨ New loading backgrounds

Merge pull request #1248 from AnotherFoxGuy/return-of-the-CrashRpt

Reimplemented CrashRpt

Merge pull request #792 from ulteq/linux-mapbin-comeback

[Codechange] Reactived the terrain caching (mapbin) on linux

[Release] 0.4.5.1

Merge pull request #380 from Max98/BugFixes-Clean

Bug fixes clean