Make #untrap while carrying the non-cursed (for rogues) or blessed
(for non-rogues) Key work the same as #invoke has been doing (without
regard to its bless/curse state): when used on trapped door or chest,
that trap will always be found and disarming it will always succeed.
It should work when carried by monsters too: if they try to open a
trapped door while carrying the Key (must be blessed since they're
not rogues) the trap will be automatically disarmed. (Caveat: that
hasn't been adequately tested.)
TODO (maybe...): change the #invoke property to detect unseen/secret
door detection instead of #untrap. The latter isn't completely
redundant; it works when the Key is cursed. But quest artifacts
strongly resist becoming cursed so that isn't a particularly useful
distinction.
Also, trap hints when wielding the Key without gloves didn't notice
adjacent door and chest traps. Now it does. And the behavior is
slightly different: known traps covered by objects or monsters are
treated like unknown traps as far as the hot/cold hints go.
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