VtkArray Changes for In-Situ Array Mapping

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There are plans to replace the vtkDataArrays with the vtkArray hierarchy. As we make this change, we should also consider the possibility of changing the layout of the memory used in the class. This is mostly important when considering using VTK in-situ with simulation. The solver may well store data in a layout different than that implicitly specified by VTK. We wish the vtkArray hierarchy to encapsulate the layout of the internal memory and make it straightforward to provide a new subclass of vtkArray that will naturally be used properly by filters without deep memory copies.