This patch changes to the ruff linter. SO MUCH quicker. Removed grey and mypy as well.
Since we need m2r for converting the ChangeLog.md to rst added the m2r package for doing that only for the dev requirements
This patch also removes the setup.cfg and replaces it with the pyproject.toml. This also renames the dev-requirements.txt to requirements-dev.txt To install dev pip install -e ".[dev]"
