Noticed while investigating the broken chest whose lock was already
broken: wishing for locked, unlocked, or broken chest (or large box)
was treated as asking for something unknown. Add support for those
three prefixes, although they only have meaning for chest and box.
If more that one is specified in the same wish, whichever one comes
last overrides the others.
Also, "empty" was already an accepted prefix (for tins); honor it for
containers too.
Lastly, wishing for "box" failed. Give a large box instead. I went
back and forth about whether to do the same for "small box" and ended
up not including it, but turns out that small/medium/large prefix for
globs ends up making "small box" and "medium box" match "box" which
has now become a synonym for "large box". I'm not sure whether that
is a bonus or a bug; small box is clearly not the same thing as large
box, but getting the only available box when asking for any box seems
better than claiming not to understand the request.
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