Add wielded (and CAOs) shader

src/mesh.h

@@ -48,6 +48,12 @@ void translateMesh(scene::IMesh *mesh, v3f vec);
 */
 void setMeshColor(scene::IMesh *mesh, const video::SColor &color);
 
+/*
+	Shade mesh faces according to their normals
+*/
+
+void shadeMeshFaces(scene::IMesh *mesh);
+
 /*
 	Set the color of all vertices in the mesh.
 	For each vertex, determine the largest absolute entry in