Option to use a menu to answer yes/no prompts

Add a new boolean option 'query_menu'. If on, game will pop up
a menu for specific yes/no questions, instead of using an input prompt.

include/flag.h

@@ -231,6 +231,7 @@ struct accessibility_data {
  * and probably warrant a structure of their own elsewhere some day.
  */
 struct instance_flags {
+    boolean query_menu;    /* use a menu for yes/no queries */
     boolean showdamage;
     boolean debug_fuzzer;  /* fuzz testing */
     boolean defer_plname;  /* X11 hack: askname() might not set gp.plname */

include/optlist.h

@@ -581,6 +581,9 @@ static int optfn_##a(int, int, boolean, char *, char *);
     NHOPTB(pushweapon, Behavior, 0, opt_in, set_in_game,
            Off, Yes, No, No, NoAlias, &flags.pushweapon, Term_False,
            "previous weapon goes to secondary slot")
+    NHOPTB(query_menu, Advanced, 0, opt_in, set_in_game,
+           Off, Yes, No, No, NoAlias, &iflags.query_menu, Term_False,
+           "use a menu for yes/no queries")
     NHOPTB(quick_farsight, Advanced, 0, opt_in, set_in_game,
            Off, Yes, No, No, NoAlias, &flags.quick_farsight, Term_False,
            "skip map browse when forced to looked at map")