SFML3Example compile error

[tzngit]

there are many errors in this file SFMLOrthogonalLayer.hpp .
It looks like there are many usage written in SFML2 but not SFML3, and when I follow this Guide I can fix some error, but there are stll a lot.

[fallahn]

Ah, could be because of #163

[tzngit]

I pull a request to fix it if you don't mind. #166