OpenVR → Core Relation

File in Rendering/OpenVR	Includes file in Rendering/Core
vtkOpenGLAvatar.h	vtkAvatar.h
vtkOpenVRControlsHelper.h	vtkProp.h
vtkOpenVRFollower.h	vtkFollower.h
vtkOpenVRHardwarePicker.h	vtkPropPicker.h
vtkOpenVRInteractorStyle.h	vtkInteractorStyle3D.h
vtkOpenVROverlayInternal.h	vtkInteractorStyle3D.h
vtkOpenVROverlayInternal.h	vtkRenderWindowInteractor.h
vtkOpenVRPropPicker.h	vtkPropPicker.h
vtkOpenVRRenderWindowInteractor.h	vtkRenderWindowInteractor3D.h