Code Cleanup

[hgn]

The code SHOULD be cleaned up. Most important: simplified. The intention of this repository is understanding, not to get the latest CPU cycle optimized. The code should read like a novel, somehow

• So, no Python hacks, even if they are cool, it is important that Python Newcomers understand the code too
• longer functions than 20 lines (soft limited) should be splitted into smaller functions with a nice name, if this is done correctly then no comments are required, or only some comments.

[reisub-de]

It got a lot better in the meantime

TODO:

• there are still some typehints missing
• docstrings need improvement
• module docstrings