Resolve Duplicate States.

Resolve the state of a pair of duplicate entities with the '?set=' query parameter as 'true' or 'false'.
Setting duplicate to 'true' will make entityId invisible for most purposes and otherId will continue to function as normal.
Setting duplicate to 'false' means the two entities are in fact separate but similar and they will both continue to exist independently but will no longer be identified as duplicates of eachother.

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