Harmonise python code standard with graphsense-lib

[soad003]

The template is based on pyscaffold.

Improvements:

• Single source of truth for package deps (setup.cfg)
• Separation of development and runtime dependencies.
• no need for manifest.in (see)
• automatic version management via git tags (no _version.py anymore see)

New features:

• Enforced linting and code formatting and other safety checks on commit (no commit with errors)
• Automatic documentation (html, latex) generation via sphinx
• tests for multiple python versions via tox
• simple upload to pypi and readthedocs if needed.

Todos when moving to new repo (dev):

• (CAUTION) I would suggest freshly cloning this repo when testing this branch, pre-commit hooks could otherwise mess with the other branches.
• regenerate config.yaml (path to confidence.csv changed)
• recreate venv (just to be sure everything works)

Todos when merge:

• check if git tags are set properly

[mdragaschnig]

I did a fresh install and testing, looking good.