From a bug report: playing mastermind
with the castle drawbridge yields a sequence of "you hear tumblers click and
gears turn" messages when the notes are partly right, but no sound when all
notes are right and you succeed in opening the bridge. Blinded hero won't
know that it has opened and could reasonably expect to have heard 5 gears
turning. This gives a general gears turning message (for any bridge changed
by any means, not just castle's tune) when it opens or closes out of view of
the hero. So, you get a message about seeing it open when that is the case,
or about hearing gears if you can hear but not see, or no feedback if you
can't see it or hear it (You_hear() is a no-op when you're deaf).
Also, scatter some iron chains when a drawbridge gets destroyed. Iron
chain seems to be the only really suitable item available for bridge debris.
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