Update build config (Closes #304)

Klaus Zimmermannrequested to merge
a002160/climix:update-build-config into main

This brings a few updates to our infrastructure, particularly considering build.

  • Remove setup.py and setup.cfg in favor of a more complete pyproject.toml
  • Move from Versioneer to Setuptools-scm for version handling
  • Remove obsolete Pylama config
  • Update dependencies

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