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Enabled vector component visualization in volume representations (v2).

Alvaro Sanchez requested to merge alvaro.sanchez/paraview:fix-vector-data-2 into master

Internally, VectorMode uses GPUMapper's independent component support to render a single component (by adjusting the weights) [2]. It computes the vector's magnitude through a vtkImageMagnitude instance [1]. Volume vector mode uses vtkScalarsToColors interface to pass the current mode/component from pqDisplayColorWidget.

[1] Vector's magnitude volume and its surface rendering counterpart vectors_magnitude vectors_magnitude_surf

[2] Vector's component volume and its surface rendering counterpart vectors_y_component vectors_y_component_surf

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