Use tuple for tradeoff costs consistently #3
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StaticDesigns.ArrangementMDP
uses a tuple to store the tradeoff costs but both MDPs structs for generative designs used vectors. This PR makes sure that all MDP structs consistently use tuples for the tradeoff costs. Besides being more uniform in design, this is a very minor performance improvement and correctness check, as the length of the tradeoff "vector" cannot be longer than 2.