Python port of the perfect-freehand library

[kepstin]

Hi all!

As part of the work we're doing on the BigBlueButton project to integrate tldraw, we found that it would be helpful to be able to replicate the rendering of the drawing strokes from a Python script. As part of that work, I've done a port of perfect freehand to Python!

Please check out the github repo and the online documentation.

The current state is that the algorithm matches the state of the perfect-freehand repository's main branch. One of the things I have done to ensure the output matches is that I have also ported the tests to Python - it runs the same tests, and verifies against the same output.

I'd appreciate any feedback!