Needed by the VR games Forewarned and Überlaüfer.
I had to put the parameters of the header functions on newlines because they're too long. Did the same for the other headers for consistency. windows.security.cryptography.idl uses a similar style.
-- v2: windows.perception.stub: Implement ISpatialSurfaceObserverStatics2::IsSupported(). windows.perception.stub/tests: Add ISpatialSurfaceObserverStatics2::IsSupported() tests. windows.perception.stub: Add ISpatialSurfaceObserverStatics2 stub interface. windows.perception.stub: Add ISpatialSurfaceObserverStatics stub interface. windows.perception.stub: Add DLL. include: Add windows.perception.spatial.surfaces.idl file. include: Add windows.graphics.directx.idl file. include: Add windows.perception.spatial.idl file.