'unicode.py' is messy

[popzxc]

Currently, unicode.py is written in the out-of-date style of Python and is, honestly, hard to work with.

I am more than willing to refactor and rewrite it in the modern Python3 with enforced type checks (without making it too fancy and "pythonic" though; I understand that it's not the Python repo), but not sure whether it will be welcome.

Will it?

[Manishearth]

Hmm, so part of the thing is that all (most) of the rust unicode crates use some shared python code for this and being consistent cross crate is very useful. So I'm open to having some stuff be refactored but ideally it's done across the unicode-rs org which is a bigger task.

[Manishearth]

I think it's worth making the PR, this crate is the most up to date when it comes to the python, and maybe we can file followups on the other crates to copy the style here