Replace clientmap's MeshBufListList with a hashmap

src/client/clientmap.h

@@ -37,25 +37,6 @@ struct MapDrawControl
 	bool show_wireframe = false;
 };
 
-struct MeshBufList
-{
-	video::SMaterial m;
-	std::vector<std::pair<v3s16,scene::IMeshBuffer*>> bufs;
-};
-
-struct MeshBufListList
-{
-	/*!
-	 * Stores the mesh buffers of the world.
-	 * The array index is the material's layer.
-	 * The vector part groups vertices by material.
-	 */
-	std::vector<MeshBufList> lists[MAX_TILE_LAYERS];
-
-	void clear();
-	void add(scene::IMeshBuffer *buf, v3s16 position, u8 layer);
-};
-
 class Client;
 class ITextureSource;
 class PartialMeshBuffer;