Added high-performance triangle decimation algorithm

Will Schroederrequested to merge
will.schroeder/vtk:Binned-Decimation into master

vtkBinnedDecimation is a high-performance, threaded algorithm for reducing the number of triangles in a mesh. It is similar to vtkQuadricClustering but typically 10-50x faster.

Edited by Will Schroeder

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