Message types specific to classes
thing and room:
- /visual/short
-  [always available]
 Short description of a room or an object. If not defined it equalsquery_name().
- /visual/long
-  [always available]
 A detailed description of the object. When the object is a holder,
this type describes the object as seen from the outside (see/visual/long/inbelow).
- /visual/search
-  [optional]
 This is for thesearchcommand, it should reveal secrets,
hidden passages, and such.  The requests are made in the form/visual/search/nwhere n is the skill level
of the searcher (between 0 and 100).  The type/visual/serachreveals all secrets.
room:
- /visual/exit
- [always available]
 Names of those exits of a room that are tagged asROOM_VANILLA(see documentation about rooms).
- /visual/item/x
- [optional]
 Description of itemx. This is used for describing
items in a room.
holder:
- /visual/long/in
- 	[always available]
 A detailed description of a container, as viewed from the inside (for
example a room from the inside).
- /visual/inventory
- [always available]
 The inventory of a container, basically it is just a list of
/visual/short's of objects in the inventory.
- /visual/inventory/living
- [always available]
 Like/visual/inventory, but the non-living objects
are filtered out.
- /visual/inventory/nonliving
- [always available]
 The descriptions of non-living things in inventory of a container.