Tue Jul 17 22:10:08 EDT 2018

State machines

I'm disappointed that this is so hard to express.  I really want the
convenience of multiple assignments.  It's still possible though but
requires boilerplate.

So first, make a real state machine.  Something simpler than the uart.
Then iron out the language.

EDIT: I have a basic skeleton for the UART.  Needs some cleanup, but
basically it seems ok.