Project setup enhancements

[white-gecko]

• Use poetry (https://python-poetry.org/)
• Use black (https://black.readthedocs.io/en/stable/)
• Use click (https://click.palletsprojects.com/en/latest/)
• Some cleanup

[white-gecko]

If you have any questions regarding this pull-request or if you would like to have it in small portions, please tell me.

[white-gecko]

Thank you