Implemented metadata editor. closes #19

src/modules/stream/stream.h

@@ -80,6 +80,8 @@ private:
 	void unload_building(int id);
 	void request_item(int type, int item);
 	void update_items();
+	void remove_generated_stuff();
+	void remove_building(int index);
 	void checkpoint();
 	void undo();