Alter the "feedback" config element to better support non-parallel controls

[ho0ber]

The current "feedback: true/false" approach is a bit naive. Instead it should be "direction: in/out/both" or something similar, to allow a control to have different entries for input and output.

This might also be a good time to refactor the way status updates are pushed to the board - right now there are a lot of different methods called to update multiple stuff.