Check the various uarm, uwep, and so forth pointers to make sure that
they point to items in hero's inventory and that those items have the
corresponding W_ARM, W_WEP, &c bit set in their owornmask field.
Also check whether any other items in inventory have the same bit set.
[Some of this is already handled by sanity_check_worn() in mkobj.c.]
Also validate two-weapon combat mode. I don't recall ever seeing any
problems reported about it though.
Does not validate ball and chain. Those should have their own sanity
checks that validate a bunch of other stuff besides just worn slots.
They already get some checking by the normal object tests.
This works ok with 'sanity_check' set and items worn and wielded
normally. The only insane situation tested was by reverting the
confused-looting-with-quivered-gold fix from earlier today. I haven't
used a debugger to force other such problems so this isn't very
thoroughly tested.
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