Update package to modern standards

[phackstock]

Is your feature request related to a problem? Please describe.

The current packaging information uses setup.cfg, setup.py and versioneer.py.

Describe the solution you'd like

To keep up with modern standards, setup.cfg and setup.py should be combined into the new pyproject.toml and instead of versioneer we should use either setuptools_scm of the poetry dynamic version plugin.