BUG: Fix the wrapping of QVTKInteractor.
In Python, the QVTKInteractor class wasn't inheriting any methods from its superclass vtkRenderWindowInteractor and was useless as a result. The python wrappers were confused because the prefix is "Q" instead of "vtk". The main kits have a vtkKitHierarchy.txt file that the wrappers can use to ascertain type and inheritance without relying on prefixes, a simple solution here is to use the hierarchy file that was generated for Rendering. Change-Id: Idba365ea61d7153dfd63f678dd36318ba429dc93