Move scalar bar GL2PS special case handler from PV to VTK.
This patch moves the special handler code for scalar bars from paraview into VTK. The code was originally in PV as the PVScalarBar differed significantly from vtkScalarBar, but now that they share more of their implementations VTK can handle the export. Change-Id: Icf37d51f46ba2569db86da1125c5c0c4f247747f
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