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ENH: Support string types in ArrayListTemplates

Sankhesh Jhaveri requested to merge sankhesh/vtk:support_string_arraylisttemplate into master

This change adds template specialization of ArrayPair struct for vtkStdString type.

This was required so as to allow point and cell string arrays to be copied through to output in vtkAlgorithm classes.

This change fixes the issue raised where catagorical colors were not working in ParaView as it relies on vtkGeometryFilter to pass the dataset attributes from input to output.

Related issue reported: https://discourse.paraview.org/t/interpret-values-as-categories-not-working-for-string-properties-pv-5-11-0-rc2/11155/1

Edited by Sankhesh Jhaveri

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