Cleaning up pqDisplayPolicy.
Deprecating pqDisplayPolicy for the most part. vtkSMParaViewPipelineControllerWithRendering is now the class that manages all the logic in pqDisplayPolicy instead. Updating vtkSMViewProxy API to add CanDisplayData() which is needed for vtkSMParaViewPipelineControllerWithRendering to work correctly. Fixed usage of pqDisplayPolicy is core ParaView. Plugins and examples still need to be updated. Change-Id: I4188acaceedde2e0fe8e927e142b9a62615515f9
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