Add TreeTraversalState::diff
#1175
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Adds a
diffmethod toTreeTraversalState. This method calls a callback function for each state instance that is different in the current traversal compared to the previous one.The idea is that this allows us to report per-view-group tile state changes. We can use that to build a system that keeps points on terrain as a tileset refines/unrefines.
I think this is in pretty good shape, but I've marked it draft for now. The next parts we build on top of it might end up influencing the design.