I think being asleep or unconscious ought to override vision the way
that being blinded does, but that's a more ambitious change than I care to
tackle. This replaces You("see ...") with You_see("..."), comparable to
You_hear(). It catches the reported door case and several variations of
light sources burning out while on the floor rather than in inventory, but
it probably misses some other cases. zap_over_floor() in particular is
highly suspect.
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