WebXR → VR Relation

File in Rendering/WebXR	Includes file in Rendering/VR
vtkWebXRCamera.h	vtkVRHMDCamera.h
vtkWebXRInteractorStyle.h	vtkVRInteractorStyle.h
vtkWebXRModel.h	vtkVRModel.h
vtkWebXRRenderer.h	vtkVRRenderer.h
vtkWebXRRenderWindow.h	vtkVRRenderWindow.h
vtkWebXRRenderWindowInteractor.h	vtkVRRenderWindowInteractor.h