A consultation interface

TODO: Spec this out.

A consultation interface is an entity that is able to dispense plans in response to a provided set of "goal" states. This interface might be a learning entity and it might be context-aware.

TransitionDirector: Director {
  function setUp(transaction) {
    plans = consultation.describePlansFor(leftState, rightState)
    // Maybe change the plans if we don't like them here.
    transaction.add(plans)
  }
}