ivory-px4-hw: start porting to tower9
ivory-px4-hw: IOAR motor control stubbed out until it type checks
ivory-px4-hw: get the rest of the drivers to type check, but still broken

in each of these we're either creating or passing around monitor-scoped Emitters
that cannot be realized. We need to figure out how emitters are going to be
created inside statemachine, add syntax, and fix up all of these places they're
used.