Lfun:	forbid_item_enter - forbid an item to enter a container

Synopsis:
	int forbid_item_enter(object item)

Description:
	The forbid_item_enter function is called in a container before
	an item tries to enter it, for example if a player wants to put it
	in.

Return value:
	Return 1, if the item mustn't enter the container, 0 if it may.

Examples:
	An container that doesn't like torches:

	forbid_item_enter(item) {
		if (item->id("torch")) return 1;
	}

See also: object/notify_item_enter, object/notify_item_leave, object/forbid_item_leave, object/notify_enter_container, object/notify_leave_container, object/forbid_enter_container, object/forbid_leave_container, object/drop, object/get, efun/move_object, efun/transfer