Name: add_extra_object/remove_extra_object

Synopsis:
	#define EXTD_ROOM
	#define EXTRA_OBJECTS
	#include <room2.h>
	add_extra_object(file, id)
	add_extra_object(file, id, count)
	remove_extra_object(file)

Description:
	Making room items "gettable". Better use produce ;-)

Note:
	Some information about these functions can be found on page 20 in
	the tutorial of advanced room coding ('goto /guild/adv/inner3') or
	via https://nemesis.de/lpc/doc/room2/page20 .

See also: room/produce