Mise à jour des textures (dont skybox)
Mise à jour CubeSkybox.hpp
Merge branch 'master' of https://github.com/flavienINK/IMAINECRAFT

Conflicts:
	bin/Imac2GL3
	src/imac2gl3/cameras/FreeFlyCamera.o
	src/imac2gl3/shapes/GLShapeInstance.o
	src/imac2gl3/shapes/Terrain.o
	src/main.o