Maiko SDL code for SDL3 requires update for release version of SDL3 3.1.2

[nbriggs]

There appear to have been some significant changes to the APIs between the prerelease SDL 3.1.0 and the release version 3.1.2 that is currently available. At least the following areas need to be addressed before we can compile/run with the released SDL3

• some key names have changed: SDLK_QUOTE renamed SDLK_APOSTROPHE SDLK_BACKQUOTE renamed SDLK_GRAVE
• SDL_GetRendererInfo has been removed and replaced by a generic property mechanism
• signature of SDL_CreateRenderer() has changed

There may be additional considerations beyond the compilation errors that result from the above.

[nbriggs]

There have been more significant API changes from early prerelease SDL3 code to "current" SDL3 code (still unreleased). In order to test with SDL3, until there is a real release, you need to fetch assets from a workflow build action -- see for example libsdl actions - but the maiko SDL3 code isn't going to keep up with the API changes until there's a real release.

[pamoroso]

SDL3 3.1.3 has reached ABI lock.

[nbriggs]

I'll look at this again in a couple of weeks. When I looked at the feature differences between SDL2 and SDL3 I didn't see anything that would obviously benefit maiko.