Update chess to v6, fix all envs to render at correct FPS, clean up pygame code

[elliottower]

Description

There was an issue in the discord about chess having the wrong first player, turns out the issue was a typo relating to the rendering images. I also normalized all of the classic environments to actually tick according to their specified render FPS, as most of them just ran as fast as possible despite saying they had a given FPS.

This will likely mean all of them will have to use EzPickle, but I'm waiting until that test fails to change it.
Edit: they did not fail because the pickle test did not use render mode human, therefore the pygame clock was not initialized, but I figure we might as well check that things can be pickled no matter what. Previously in shimmy I had some issues pickling rendered environments, so it's good that this works. I think if you try to pickle and unpickle an env it doesn't directly work with rendering naively but I think you can do env.reset() and it will work?

Not sure if we can do a warning if people try to pickle rendered envs, maybe it's fine to just tell them not to do that.

Fixes # (issue), Depends on # (pull request)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Checklist:

• I have run the pre-commit checks with pre-commit run --all-files (see CONTRIBUTING.md instructions to set it up)
• I have run pytest -v and no errors are present.
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I solved any possible warnings that pytest -v has generated that are related to my code to the best of my knowledge.
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[elliottower]

This ended up being a large number of changes in one PR so apologies for that, just figured I'd do pretty much all of the pygame related fixes here.

[elliottower]

Cooperative pong had some very weird bugs due to the observations using pygame as well as the rendering, but the tests now pass locally so I think it should be good.