Modified SceneNode::FrustumCull

Now provides an implementation which will test the bounding volume
against the frustum (Basic frustum culling)
Is now const
Disabled face culling on sprites


Former-commit-id: 5cb7a94b38ef8b0ffa5a78f16f5ef65a59ab375d

include/Nazara/Graphics/SceneRoot.hpp

@@ -26,7 +26,6 @@ class NAZARA_API NzSceneRoot : public NzSceneNode
 		NzSceneRoot(NzScene* scene);
 		virtual ~NzSceneRoot();
 
-		bool FrustumCull(const NzFrustumf& frustum) override;
 		void Register();
 		void Unregister();
 };