Command repeating by using cmd queues

This replaces the old pushq/saveq arrays (which were used to save
the keys pressed by the user for repeating a previous command)
with a new command queue.  This means there's no hard-coded limit
to the saved keys, and it can repeat extended commands which are
not bound to any key.

win/win32/mswproc.c

@@ -1848,12 +1848,6 @@ mswin_get_ext_cmd(void)
             ret = -1;
     }
 
-    if (!g.in_doagain) {
-        if (ret >= 0)
-            savech_extcmd(cmd, TRUE);
-        else
-            savech(0);
-    }
     return ret;
 }