Parallel Union Find #33
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Replaces the depth-first-search (DFS) island builder with union-find (UF).
UF has been made mostly parallel, which seems impractical for DFS.
This will help Box2D scale to more cores.
TODO : finish testing sleep
Update: this PR won't be merged. I'm using persistent islands instead of parallel union-find. The main problem with parallel-union find is lack of determinism.