Change distribution method from Frozen PyInstaller glob

[txoof]

Currently PaperPi is distributed as a single Frozen glob using PyInstaller. This is brittle, large and generally a pain to maintain. It is also not possible to add, test, or adjust plugins without rebuilding the entire project and redistributing it. This isn't ideal.

Finding a new distribution method would be much better.

[txoof]

This is under way at a new version of Paperpi