convert libs/protoboard to use BlackBoardInterfaceListener

[todo]

fawkes/src/libs/protoboard/blackboard_manager.h

Lines 81 to 86 in 98cfe88

	// TODO: This rather unspecific waker just triggers a loop(), so we need to go over all the interfaces
	// each time and check where there's a message in the queue. This should be converted to a
	// BlackBoardInterfaceListener, which calls a specific method and passes in the affected interface
	// right away. That should allow significant simplification of all this template hackery.
	waker_ = new fawkes::BlackBoardOnMessageWaker(blackboard, interface_, thread);
	}

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This issue was generated by todo based on a TODO comment in 98cfe88 when #171 was merged. cc @fawkesrobotics.

[stale]

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