test: test on ubuntu, macos, windows. Support py3.9-3.12

[tlambert03]

just curious to see what breaks

fixes #9

[tlambert03]

black and mypy are failing, but that is another PR (#8)

[tlambert03]

some issues, from witty...

• fcntl is not available on windows. The substitute is win32api calls... but that's not a drop-in replacement. so that will take some doing.

  C:\hostedtoolcache\windows\Python\3.11.9\x64\Lib\site-packages\witty\compile_module.py:2: in <module>
      import fcntl
  E   ModuleNotFoundError: No module named 'fcntl'
  

• distutils is no longer available in python 3.12+ ... so direct setuptools dependencies should be used instead

but looks like *nix platforms on 3.9-3.11 are fine

[tlambert03]

the witty issues were patched in funkelab/witty#2

[tlambert03]

looks like this package can't support python 3.13 yet because cheetah3 uses cgi which is removed in python 3.13. See CheetahTemplate3/cheetah3#63 for progress

[tlambert03]

ok everything is now almost working across all platforms and python versions. The last holdout is windows, and it's because I can't yet figure out how to get the <stdatomic.h> include working on windows. If simply define RTREE_NOATOMICS when compiling, then everything also works on windows (which is great!). I think we should just do that for now... but that requires a change in witty... which is what prompted funkelab/witty#3

[tlambert03]

All working now, but with the caveat on windows that we use no atomics