Generated stuff removal done, closes #27

src/modules/stream/stream.h

@@ -25,6 +25,7 @@ private:
 		Transform xform;
 		AABB aabb;
 		int worktime[2];
+		bool generated;
 		static void from_dict(struct building *b,
 				      const Dictionary &dict,
 				      const String &key);
@@ -80,6 +81,7 @@ private:
 	void unload_building(int id);
 	void request_item(int type, int item);
 	void update_items();
+	void filter_generated_stuff();
 	void remove_generated_stuff();
 	void remove_building(int index);
 	void checkpoint();