Like /m for nearby monsters and /O for all objects, implement /^
and /" to view a list of nearby traps or all known traps. Only
lists discovered traps (or mimics immitating traps, or detected
door or chest traps iff still shown as such on map), but lists
map traps even when an object or monster at the same location is
blocking view of them.
For traps on the Water and Air levels that have been mapped, they
will only be listed when within line of sight so that this feature
can't be used to track portal location as it moves around. However,
when within line of sight it does allow the portal to be recognized
if that has become covered.
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