Merge branch 'next' into gametype-refactor-1

.gitignore

.gitlab-ci.yml

CMakePresets.json

cmake/CPM.cmake

cmake/Comptime.cmake

extras/conf/udb/Includes/SRB222_common.cfg

extras/conf/udb/Includes/SRB222_linedefs.cfg

extras/conf/udb/Includes/SRB222_misc.cfg

extras/conf/udb/Includes/SRB222_things.cfg

extras/conf/udb/SRB2-22binary.cfg

libs/SDL2/WhatsNew.txt

libs/SDL2/cmake/sdl2-config-version.cmake

libs/SDL2/cmake/sdl2-config.cmake

libs/SDL2/docs/CONTRIBUTING.md

libs/SDL2/docs/README-android.md

libs/SDL2/docs/README-cmake.md

libs/SDL2/docs/README-directfb.md

libs/SDL2/docs/README-dynapi.md

libs/SDL2/docs/README-emscripten.md

libs/SDL2/docs/README-gdk.md