Convert search in tty menus from pmatch to case-insensitive pmatchi;
convert search in X11 menus from substring strstri to wildcard pmatchi.
tty bug: if the menu is full screen, the search prompt and subsequent
user input clobbers the menu header.
Same functionality as was recently implemented for tty. If a
character like ':' is an explicit menu selector and the player
types it, select that menu entry rather than treating it as a
search request. (Same for other menu commands like '>', but
offhand I can't think of anything besides container looting's
': - look inside' that uses any non-letter selectors other
than '$', which isn't used as a menu meta command.)
When GOLDOBJ is defined, dropping partial amounts of gold using the D
command would not work because gold currently has the same inventory letter
as the coin group accelerator. In this case, the group accelerator should
not be used, since it confuses counts. tty and X11 ports are fixed. The
tty change should fix the Windows console version as well (untested).
