OpenXR → VR Relation

File in Rendering/OpenXR	Includes file in Rendering/VR
vtkOpenXRCamera.h	vtkVRHMDCamera.h
vtkOpenXRControlsHelper.h	vtkVRControlsHelper.h
vtkOpenXRInteractorStyle.h	vtkVRInteractorStyle.h
vtkOpenXRModel.h	vtkVRModel.h
vtkOpenXRRenderer.h	vtkVRRenderer.h
vtkOpenXRRenderWindow.h	vtkVRRenderWindow.h
vtkOpenXRRenderWindowInteractor.h	vtkVRRenderWindowInteractor.h