Use pyproject toml and importlib.metadata

[maxrjones]

Follows up on the recommendation in #372 (comment) to use pyproject.toml rather than setup.py + setup.cfg.

Still need to check whether there's any impacts from the deprecation of cmdclass and switch from versioneer to importlib.metadata.

[martindurant]

Do you intend to do more here before taking off "WIP"?

[maxrjones]

Do you intend to do more here before taking off "WIP"?

Yes, want to double check on this:

check whether there's any impacts from the deprecation of cmdclass and switch from versioneer to importlib.metadata.

I'll ping for a review after getting to that (should be tomorrow morning)

[martindurant]

I would like to release today or this weekend, so it would be nice to make use of this work

[maxrjones]

I would like to release today or this weekend, so it would be nice to make use of this work

Looking now

[maxrjones]

@martindurant the version format from setuptools_scm (e.g., 0.2.0.post62) differs from the prior versioneer setup (e.g., 0.2.0+59.gff2d639). The options from setuptools_scm include guessing the next minor version and appending the commit hash. Please let me know if you'd rather a different format. Otherwise, the passing tests and a quick check on the version suggests this is good to go.

[martindurant]

I think that's fine.