Moves where the piece doesn't move

It would be good to support a type of move where a piece can capture without moving itself. Currently this is definitely possible through implementing an action that 'teleports' the piece back to its original square after the move, and this might actually be enough. But it's worth investigating potential value in having this as part of the move definition. I think the decider for this will be whether there are variants with the sort of behaviour already in existence that would require it. Note that it's also possible through an action to only 'teleport' after certain moves.