Modernizing build system

[jfields7]

The current build system for PyCompOSE to make it installable via pip is to use the older setup.py procedure. This often throws deprecation warnings in some versions of pip and can throw errors on newer versions. The more modern approach is to write a pyproject.toml file. There are workarounds (e.g., installing the wheel package), but it would be good to update this to follow currently recommended practices.

[dradice]

Does the pyproject.toml approach support building of a dynamically linked library (for NQT)? The last time I looked into it, that was not possible.

[jfields7]

It looks like it's possible to do some sort of hybrid where you have a minimal pyproject.toml file that defers to setup.py for the actual setup. The setup.py file itself isn't deprecated, but calling python setup.py install is, which is what python -m pip install . will revert to if it doesn't find pyproject.toml.