add customcolors option

customcolors (default) and !customcolors toggle whether the
custom colors get applied to the glyphmap.

src/options.c

@@ -5229,6 +5229,9 @@ optfn_boolean(
             go.opt_need_redraw = TRUE;
             go.opt_need_glyph_reset = TRUE;
             break;
+        case opt_customcolors:
+            go.opt_reset_customizations = TRUE;
+            break;
         case opt_menucolors:
         case opt_guicolor:
             update_inventory();
@@ -8389,6 +8392,7 @@ doset_simple_menu(void)
 
     go.opt_need_redraw = FALSE;
     go.opt_need_glyph_reset = FALSE;
+    go.opt_reset_customizations = FALSE;
     pick_cnt = select_menu(tmpwin, PICK_ONE, &pick_list);
     /* note:  without the complication of a preselected entry, a PICK_ONE
        menu returning pick_cnt > 0 implies exactly 1 */
@@ -8479,7 +8483,11 @@ doset_simple(void)
         }
         if (go.opt_need_promptstyle)
             adjust_menu_promptstyle(WIN_INVEN, &iflags.menu_headings);
-/*
+        if (go.opt_reset_customizations) {
+            reset_customizations();
+            docrt_flags(opt_crt_flags);
+        }
+        /*
  *      I don't think the status window requires updating between
  *      simplemenu iterations.
         if (disp.botl || disp.botlx) {
@@ -8729,6 +8737,10 @@ doset(void) /* changing options via menu by Per Liboriussen */
     if (go.opt_need_glyph_reset) {
         reset_glyphmap(gm_optionchange);
     }
+    if (go.opt_reset_customizations) {
+        reset_customizations();
+        docrt();
+    }
     if (go.opt_need_redraw) {
         check_gold_symbol();
         reglyph_darkroom();