Build system, CI and fixes

[xl0]

• Update the build system
• CI tests on mac and win, reduced the number of versions we test
• Fix unit test test, chaining just works
• Publish workflow:
  • Push a tag - publishes to pypy
  • If tag has -test in it, publishes to test.pypi
• Fix AST to work with all python version, highlight named constants (True, False, None) on legacy.
• Remove leftover python 2 checks.

[xl0]

Min version is 3.7, which is the last version with significant downloads on pypi.

[xl0]

Also, pip install -e does not install the hook. I never figured out how to do it for lovely-tensors, and I think the issues lies with editable installs being hooks themselves, and while it might be possible to figure it out, I don't think it's worth the time. I don't think this ever worked, at least not with modern python.

[Qix-]

Wow, this is amazing. I learned a lot just reading through this; thank you so much for taking the time.

I'm pretty dead for the evening today, let me get to this tomorrow as I'll need to set up the trusted publishing stuff as well and make sure everything works.

Thank you again!

[xl0]

@Qix- Hey, just checking in, all good? Let me know if something does not work or does not make sense.

[xl0]

@Qix- 👋 👋

[Qix-]

Haven't forgotten about this (It's been sitting in my inbox), I just haven't had time the last few weeks to sit down and figure it out. Sorry about that <3 Will do it soon.