Initial port to SDL3 #38

Job	Run time
build (ubuntu-latest, Release, gcc)	3m 23s
build (ubuntu-latest, Release, clang)	3m 43s
build (ubuntu-latest, Release, mingw-w64-gcc)	2m 42s
build (ubuntu-latest, Debug, gcc)	2m 20s
build (ubuntu-latest, Debug, clang)	2m 39s
build (ubuntu-latest, Debug, mingw-w64-gcc)	1m 48s
build (windows-latest, Release, cl)	5m 11s
build (windows-latest, Debug, cl)	5m 0s
build (macos-latest, Release, gcc)	3m 33s
build (macos-latest, Release, clang)	3m 3s
build (macos-latest, Debug, gcc)	2m 59s
build (macos-latest, Debug, clang)	3m 10s
	39m 31s

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