Rewrite paths for simplified SVG

[JayFoxRox]

The paths in SVG can be written in various ways. The ruleset is really loose, so different tools might export the path very differently.
It even makes me consider a non-SVG format instead of a simplified SVG for storage.

We should also have a rule about where each path starts and consider reversing it to be consistent (for example: of the start/end point, the top-left point could be chosen, to get consistent ordering).

For now, we can probably use https://pypi.org/project/svg.path/ to parse and rewrite the path for our simplified SVG.
However, that library is very limited in the choices is offering for rewriting and I don't think it follows the SVG spec exactly. It's just a lightweight choice which can be used so we don't bikeshed over tooling.