+/* Return world.thing_actions ThingAction.id for "name" or 0 if none found. */
+extern uint8_t get_thing_action_id_by_name(char * name);
+
+/* Return thing of "id" in chain at "ptr", search inventories too if "deep".
+ * Return NULL if nothing found.
+ */
+extern struct Thing * get_thing(struct Thing * ptr, uint8_t id, uint8_t deep);
+
+/* Get pointer to the non-owend Thing struct that represents the player, or NULL
+ * if none found.
+ */