Upd: Arguments in main changed for consistency
Upd: Custom events moved to root constants.py

Main exclusively handles events, so having the custom events defined in
UI's constants didn't make much sense. I believe they are better suited
to the root constants.py
Docs: Update to v0.911

I'm calling this v0.911 as no changes noticeable to the end-user have
occurred, so v0.92 doesn't seem justified, but the previously poor state
of the state-transition functions bothered me so much I want this fix
pushed to master immediately.

Also, mistake corrected in README.