Port to SDL3

[eszlari]

https://github.com/libsdl-org/SDL/releases/tag/release-3.2.0

[viewizard]

I see they finally released it, but I don't have time for now for migration to 3 version. Probably, will have time during vacation.

[viewizard]

Checked SDL2-compat game compilation and work, and looks like SDL3/SDL2-compat have issue with mouse grub libsdl-org/SDL#12133