Name: set_items - set room item IDs and descriptions in a room

Synopsis:
	#include <room2.h>
	void set_items(string *items_arr)

Description:
	The set_items call sets the item identifiers and descriptions in a
	room. Room items are entities in a room a player can look at.
	Normally everything that is mentioned in the long description should
	have an item description. Recursive item descriptions are possible
	and appreciated, too: an item is described via an other item. This
	other item's description points back to the first item.

	The single argument is an array of even length with an room item ID
	specification and description after each other. Set_items affects
	the long and id function in the room. 

	The ID specification is a string containing one ore more IDs,
	separated with a '#' - see Examples:.

	Or it is "sub-array" in the list of items. Technically the notation
	with sub-arrays is the way as multiple items are stored in the room.
	Query_items (see 'man room/query_items') returns the list items in
	room also as an array with sub-arrays, an array of arrays. So it is
	useful and makes sense to support this notation, too.

	The description is a string which will be automatically completed by
	a '.' if the last char of the description is not a '!', '?' or a ' '
	('<space>').

	For dynamic items the description string could be an expression like
	"@@func@@", too. "func" is handled by the efun process_string (see
	'man efun/process_string'). Therefore functions can be called also
	in other objects and arguments can be submitted. "func" called is
	called when a player looks at this room item.

Return value: none

Examples:
	set_items( ({
	  "tree#apple tree", "The tree is full of apples"
	}) );
	set_items( ({
	  ({ "tree", "apple tree" }), "The tree is full of green apples"
	}) );
	set_items( ({
	  "tree#apple tree", "@@show_tree@@"
	}) );
	set_items( ({
	  "tree#apple tree" , "@@show_tree:players/bla/room|tree@@"
	}) );

Notes:
	All above meantioned features also are available in set_day_items
	and set_night_items - see also 'man room/set_day_items' and 'man
	room/set_night_items'.

	More about all types of room items can be found in the tutorial
	about room coding in the inner guild on the pages 8, 10 and 17 or
	or via https://nemesis.de/lpc/doc/room2/page8 (items in general),
	https://nemesis.de/lpc/doc/room2/page10 (day & night items) and
	https://nemesis.de/lpc/doc/room2/page17 (dynamic room items).

See also: object/id, object/long, room/set_day_items, room/set_night_items, room/query_items, room/query_day_items, room/query_night_items, efun/process_string, room2/page8, room2/page10, room2/page17