Added tolerance strategy to coordinate projection and merge tolerances

Open Will Schroeder requested to merge will.schroeder/vtk:Linked-Imprint-Tolerances into master

The filter uses two tolerances: a projection tolerance (to project the imprint onto the target); and a merge tolerance (to merge nearly coincident points). The relationship between them needs to be managed to produce consistent, correct results. The tolerance strategy is used to relate these two tolerances.

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