Boolean - returns 1 if property exists, 0 otherwise
player - This object is a player
npc - This object is a non-player character
noregen - Players with this property cannot be raised from the dead
dead - Things with this property are dead
guest - Players with this property are guests and cannot save
disease - Players with this property are diseased
poison - Players with this property are poisoned
stats_rearranged - This player has tweaked their stats
feeding_frenzy - This object is part of feeding frenzy quest
emote - This player can emote.
echo - This player can echo.
echoto - This player can echoto.
echoall - This player can echoall.
force - This player can force monsters and other players.
read id - What is returns when you read the object. Look at the
flower shop for an example.
dest on quit - If this is set to a non zero value, the object will be
dested when the player quits.
smithy - Set this to 1 in rooms which are smithys.
watertight - Set on all the containers which can hold liquids.
complete weight - If this property is set on an object the function
query_complete_weight() is used instead of query_weight()
when doing add_weight... Used to stop people putting
sacks in sacks and getting even more they can carry.
boyant - If this is set then the object is assumed to be boyant and
will rise to the surface instead of falling to the bottom.
fragile - Sets the weight at which the object has a chance of breaking
in a container.
String - return their value of type string if they exist, 0 otherwise.
Mixed - returns their value of type mixed if they exist, 0 otherwise.
