Use status objects from non-set objects

[teddyrendahl]

Ophyd objects may have multiple methods that return status objects that you would want to wait for in a scan. Currently this is difficult to do. A standard solution should be created either as a custom message or in the bluesky library itself.

Example

def home_then_move(motor, val):
     yield from wait_from_call(motor.home)  # Wait for status object from home message. Ignore name
      yield from mv(motor, val)   # Standard wait on a move

[ZLLentz]

This is actually pretty easy to implement, but there's a philosophical argument to made that these should be done in a setup routine if it's not a set command.