Revert templating on collapse_edge, separate overloads #2455
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Fixes #2452 by reverting some of the refactoring to template
collapse_edgebetter.This pulls out the previous overload of
collapse_edgewhich managed the queue into a separate new functioncollapse_least_cost_edge. That function's header is marked as being difficult to template correctly.Performance seems to be back to what it was before.