Allow the 'I' command to show inventory of known blessed items via
pseudo object classes B, C, U, and X. That's instead of an showing
inventory of specific object class. The two can't be combined
because 'I' operates on single character input.
I had to modify tty_yn_function to prevent it from forcing a BUCX
character into lower case (simply using lower case would cause a
conflict with 'u' and 'x' for inventory of shopping bill), and did
that by checking whether any of the acceptable response characters
are upper case. Pretty straightforward and shouldn't impact any
other uses that don't specify upper case choices.
I did the same thing for X11. Other interfaces most likely need
to do something similar. If they don't, a response of 'B' or 'C'
(for menustyle:traditional or menustyle:combination) will simply
not work, without causing any problems, same as typing an invalid
choice, and 'U' or 'X' will give shop feedback instead of the
requested subset of inventory.
The Guidebook revisions are untested.
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