Add adventure editing

[whonut]

Partially addresses #20. I expect this to need some work but I thought I'd get the ball rolling.

The commit history is a little bit wonky because I had a bit of a disaster locally and I'm too scared of losing my code again to try and make it look pretty. I hope that won't cause any issues.

[pejter]

I yapf working correctly? Seems like the line length is not set correctly. Besides that I believe we're good to go unless someone has anything to say.

[whonut]

Dang it. I took it out of the pre-commit hook because it was styling files I didn't want it to and I got annoyed by all the git status and git diff spam. Stand by.

[whonut]

Turns out you're not meant to use hooks for that. Live and learn.