Merge branch 'next' into textures-0

.circleci/config.yml

.gitattributes

.gitignore

.gitlab-ci.yml

CMakeLists.txt

CMakePresets.json

appveyor.yml

cmake/CPM.cmake

cmake/Comptime.cmake

comptime.bat

comptime.sh

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