Moving build requirements to pyproject.toml

[SoulofAkuma]

Closes #122.

According to https://setuptools.pypa.io/en/latest/build_meta.html the setup_requires parameter in setup.py is deprecated. From the linked documentation:

With the changes introduced by PEP 517 and PEP 518, the setup_requires configuration field was deprecated in setup.cfg and setup.py, in favour of directly listing build dependencies in the requires field of the build-system table of pyproject.toml.

This PR moves the dependencies specified in setup_requires to a dedicated pyproject.toml.
Adding a pyproject.toml also helps not relying on fallback behavior from pip for legacy projects: https://pip.pypa.io/en/stable/reference/build-system/pyproject-toml/#fallback-behaviour .

It would be great if this could be turned into a release to PyPi

[Kodiologist]

@scauligi Can you review this, since you wrote #46?

[scauligi]

Yup I can take a look!

[scauligi]

Works based on my own local testing; the main thing I wanted to confirm is that we wouldn't get a regression of #42.
We'll likely want a similar change for hy itself as well.

I'll formally approve once the AUTHORS (and NEWS?) commits are added!

[Kodiologist]

Yep, don't forget AUTHORS and NEWS.

I would also suggest some whitespace for readability:

requires = ["setuptools >= 42", "wheel", "hy >= 1"]

[SoulofAkuma]

Added the updates to AUTHORS and NEWS and some spaces. Does everything look good to you?

[SoulofAkuma]

Misclicked on close, sorry about that

[SoulofAkuma]

Hi @Kodiologist would it be possible to create a patch version release from this change?
The broken setuptools build is currently preventing us from building a project of ours that depends on hyrule

[Kodiologist]

Yes, it's been a while since the last release.