Fly on Windows working

Plover itself (which is embedded in Fly) uses a thread to listen for keyboard events. This is entirely appropriate for Plover, but not good for Pygame, so I disabled it; I think we're going to want to redesign Plover/Windows a bit to move that thread out where it won't bother us.

But this marks the day I start learning steno. Note: it's freaking hard. I might want to tweak Fly a little; I'm not sure I like its lesson setup - but I think that's doable.