Convert to `pyproject.toml` project file

[DeflateAwning]

Would it be okay if I converted the old setup.py project configuration to pyproject.toml with the Hatchling build system (as is currently the recommended way to ship projects)?

I'll do the work and submit a PR, but only if you pre-approve it here.

[spyoungtech]

Hmm. I appreciate the suggestion, but I'm not sure it's a necessary change. I suppose it couldn't hurt to move to pyproject.toml and I would accept that change if you wanted to make a PR for it, but I don't see a reason to use hatchling as the build backend and would prefer to avoid that.

Thanks!

[DeflateAwning]

Reason: Using modern python tooling, which does not depend on old/outdated reasons. https://hatch.pypa.io/1.7/why/

Will prepare the move to pyproject.toml with setuptools though.

This originally came up because I wanted to clean up the PyPI entry, but am not too familiar with debugging the old setuptools configurations