Added first SpotLight test shader
Added Utility.hpp
Merge branch 'Andre'

Conflicts:
	lib/include/Graphics/Scene/SpotLight.hpp
	lib/include/Utility.hpp
	lib/src/Graphics/Render/DeferredRender.cpp
	resources/shaders/DFlightSpot.frag
TGUI integration
Merge branch 'Andre'
Corrected compilation bug introduced by last commit