Make mesh able to carry material informations

- Move OBJ Loader to Utility module, where it belongs
- Change Mesh material informations from a path to a parameterlist
- Improve Mesh code


Former-commit-id: f16f48f8b6399188a09797cec3707ab6726bdbca

src/Nazara/Graphics/Graphics.cpp

@@ -20,7 +20,6 @@
 #include <Nazara/Graphics/SkyboxBackground.hpp>
 #include <Nazara/Graphics/Sprite.hpp>
 #include <Nazara/Graphics/Formats/MeshLoader.hpp>
-#include <Nazara/Graphics/Formats/OBJLoader.hpp>
 #include <Nazara/Graphics/Formats/TextureLoader.hpp>
 #include <Nazara/Renderer/Renderer.hpp>
 #include <Nazara/Utility/Font.hpp>
@@ -96,9 +95,6 @@ namespace Nz
 			return false;
 		}
 
-		// Loaders
-		Loaders::RegisterOBJ();
-
 		// Loaders génériques
 		Loaders::RegisterMesh();
 		Loaders::RegisterTexture();
@@ -176,7 +172,6 @@ namespace Nz
 
 		// Loaders
 		Loaders::UnregisterMesh();
-		Loaders::UnregisterOBJ();
 		Loaders::UnregisterTexture();
 
 		DeferredRenderTechnique::Uninitialize();