Move more setup stuff to pyproject.toml

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[claudep]

Nice! I think we can now delete setup.py completely?

I read that it might be useful for some older environments, but if you think it's not needed, we can remove it too (and see if we get complaints :wink:).

[hugovk]

Let's try without the stub setup.py.

https://setuptools.pypa.io/en/latest/userguide/quickstart.html#basic-use says (emphasis added):

We also recommend users to expose as much as possible configuration in a more declarative way via the pyproject.toml or setup.cfg, and keep the setup.py minimal with only the dynamic parts (or even omit it completely if applicable).

And https://setuptools.pypa.io/en/latest/userguide/quickstart.html#development-mode says:

Prior to pip v21.1, a setup.py script was required to be compatible with development mode. With late versions of pip, projects without setup.py may be installed in this mode.

If you have a version of pip older than v21.1 or is using a different packaging-related tool that does not support PEP 660, you might need to keep a setup.py file in file in your repository if you want to use editable installs.

If anyone needs editable installs, I think it's fair enough to require modern pip (= less than two years old).

We can always add the stub back if it's really needed.

[claudep]

OK, fine. setup.py removed!