New metadata fixes deprecation warnings from setuptools

Packaging module required by setuptools for license metadata,
older versions of cibuildwheel pinned an old version of it.

Should improve performance of the vitalized build step

Changed with Mypy update

Reconfigure CFFI porting scripts for SDL3, add _libtcod.pyi

Many SDL functions were renamed and I'd have to port them blind without
this new `_libtcod.py` file.

Update type ignores for newest Numpy

Enable more strict Mypy settings

SDL_CommonEvent and others needed to be marked as packed/flexible

Remove outdated Sphinx directives

Check if audio devices work before testing them

Update Linux wheel build workflows for SDL3

Use more specific ruff-check id

Note libtcod version as well

Note PKG_CONFIG_PATH on pkg-config errors to debug issues with the
environment sent to Python setup scripts.

This meant to mention changes to logical size,
but that is already in the changelog

Apply new Ruff fixes of unused ignores

Switch to GitHub actions and remove outdated actions

Enable PyPy wheels explicitly, required by latest cibuildwheel

Configure compile warnings to show but not fail on zlib implicit functions

Disable link flags to let Emscripten take over for SDL3

Disable Py_LIMITED_API definition to workaround issue with cffi

Related to #123

Stable version is too old and only supports SDL2

Try not to bundle win/mac binaries during Pyodide build

This duplicates build_sdl.py and maybe isn't as useful as it used to be.
I could import from that module if I really need the check in setup.py.

Ensured updated code was moved to build_sdl.py

Caused by SDL3