Add convenience helper methods for Directions and RoomXY #517
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This PR implements two helper methods.
The first is a convenience method for
Direction, to make it more convenient to iterate over all 8 directions in cases where that's necessary.The second is a convenience method for local
RoomXY, to get all valid neighbors of a particular location. This also showcases the convenience provided by theDirectioniterator method, and how it cleans up code.