'O' vs perm_invent (mostly)

'O' vs perm_invent (mostly)

Update persistent inventory window if 'implicit_uncursed', 'menucolors',
or 'guicolor' is toggled.  (curses should be changed to use menucolors
instead of guicolor to decide whether menu coloring is used.  Right now
it requires that both be On.)

Also, EDIT_GETLIN was providing junk default response when message type
or menu color looped and prompted for another entry after handling one.

Mixed in with this is a fix for easily induced buffer overflow which
has security ramifications....