Pip Install ParaStell

[connoramoreno]

Rather than manually generate executables, put ParaStell on paths, etc., making ParaStell pip-installable would streamline much of the installation process.

See this tutorial on packaging. Most of this issue will be resolved by generating a pyproject.toml file: https://packaging.python.org/en/latest/guides/writing-pyproject-toml/#writing-pyproject-toml

[paulromano]

@connoramoreno If you haven't started working on this, I can take a shot at putting together a pyproject.toml file

[connoramoreno]

@paulromano Please feel free! That would be very helpful

[Edgar-21]

We should look at including black formatting args in the pyproject.toml as well.