Interesting on its own just because it exercises stencil testing,
unlike any of the other existing manual tests.
In addition it serves as a base example for how outlines could be
done, it is one possible approach at least. (render with stencil
write, then render again slightly scaled up with a solid color with
testing against the stencil buffer content)
Change-Id: I0c845a9004136f229cab037f6f0aab2f772bdd76
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
