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/extern.h

@@ -264,6 +264,8 @@ extern void savech_extcmd(const char *, boolean);
 extern char extcmd_initiator(void);
 extern int doextcmd(void);
 extern struct ext_func_tab *extcmds_getentry(int);
+extern int count_bind_keys(void);
+extern void handler_rebind_keys(void);
 extern int extcmds_match(const char *, int, int **);
 extern const char *key2extcmddesc(uchar);
 extern boolean bind_specialkey(uchar, const char *);

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)