Lfun:	forbid_leave_container - forbid an item to leave a container

Synopsis:
	int forbid_leave_container(object container)

Description:
	The forbid_leave_container function is called in an item before
	it leaves a container, for example if a player wants to take it out.

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

Examples:
	An item that doesn't leave a bag:

	forbid_leave_container(con) {
		return con->id("bag");
	}

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