SDL_image 2.8.0

[Starbuck5]

It's a long time coming, since we've decided we need SDL_image built with libpng, and SDL_image prebuilts after 2.0.5 don't come with that.

This PR hopes to get around that using CI on a pygame-community fork of SDL_image (https://github.com/pygame-community/SDL_image/releases/tag/2.8.0-pgce) to generate release bundles with our parameters.

This allows our Windows CI and local development workflow to remain almost exactly the same through this change.

[MyreMylar]

There was a change made in CPython 3.13.0 & 3.12.1, the latter of which came out this week, removing skipped tests from the total number of completed tests in the unit test module. This caused our check that the number of started tests equalled the number of completed tests to fail. See:

python/cpython#110890

I initially assumed it was threading related due to the print output - but actually none of the threading code in our test running code is actually being used, and it doesn't actually work anymore.

In conclusion; we should probably be using pytest.

[MyreMylar]

All looks good to me. I see 2.8.0 as the version locally - the tests all pass and it works with all my GUI library examples.

Though please squash and merge to hide my messy experimentation :)

[Starbuck5]

Thanks so much for investigating and fixing this!

Though please squash and merge to hide my messy experimentation :)

I squashed all your commits in the branch together, since I don't want to have all this end up as one commit. This also unintentionally adds me as a coauthor, which I don't think I can get around.

[oddbookworm]

LGTM!

[ankith26]

Gave this PR a good spin locally on linux and all is working well!

I tested both, the CI wheel and built-locally wheel (that in my case, would build against SDL_image 2.6.3) and both pass all tests as well as my little image loader test script.

This is a good simplification of things and will also help us get a lot of new features and maybe bugfixes 🥳