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vtkThresholdPoints: Add InputArrayComponent member variable

Cory Quammen requested to merge cory.quammen/vtk:threshold-points-by-vector-component into master

Add a member variable that chooses which component in the active data array to use for thresholding. If this value is set to a number larger than or equal to the number of components in the input array to process, the magnitude of each array tuple will be used for thresholding instead of an individual component.

Updated test to exercise this feature and add some more correctness checking of the filter's output by checking the output number of points/cells in various scenarios.

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