Move most static metadata to pyproject.toml.

[Sachaa-Thanasius]

Summary

It moves most of the library's metadata to pyproject.toml from setup.py, excluding the library version due to its particular type of dynamism and the fact that code would seemingly be required for it regardless of possible alternatives like setuptools_scm.

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[Sachaa-Thanasius]

Hmm. I'm not sure what's causing the issue here, but I'd guess that moving the data somehow . . . changed the impact of manually setting PYTHONPATH to the path of the working directory, thus breaking imports? Running the same tests on my machine works just fine after an editable install, without the PYTHONPATH="$(pwd)" portion of the command. Maybe I'm missing something obvious.

[Sachaa-Thanasius]

@Rapptz Any pointers on what's causing these tests to fail? I'm guessing it has to do with the explicit PYTHONPATH in the pytest call since aiohttp can't be found for importing, and the tests seem to work fine when run locally sans explicit PYTHONPATH .

Edit: I take it back; the exact command sequence doesn't work locally. I was assuming the 'install requirements' command would installed base dependencies, but it doesn't.

Edit2: Managed to figure it out.

[Sachaa-Thanasius]

setuptools automatically installs wheel if needed. Further info is in the first note in this section: https://setuptools.pypa.io/en/latest/userguide/quickstart.html#basic-use

[Rapptz]

Thanks. Let's give this a try.