Rudimentary key rebinding in game options

Currently shown only in the full options list, as it's not
quite complete. (For example, it doesn't handle movement commands,
or the getpos keys)

include/optlist.h

@@ -132,6 +132,8 @@ opt_##a,
                  + sizeof "kick" + sizeof "force" + 20),
                 opt_out, set_in_game, Yes, Yes, No, Yes, NoAlias,
                 "action to take when encountering locked door or chest")
+    NHOPTO("bind keys", Advanced, o_bind_keys, BUFSZ, opt_in,
+           set_in_game, No, Yes, No, NoAlias, "edit key binds")
 #if defined(MICRO) && !defined(AMIGA)
     NHOPTB(BIOS, Advanced, 0, opt_in, set_in_config, Off, Yes, No, No, NoAlias,
                 &iflags.BIOS)