FS#10824 - viewport/statusbar API rework.

Hopefully the only user visible changes are:
- fm and recording screens go by the statusbar setting (sbs or inbuilt)
- plugins go back to using the theme as they should for menus and lists
- splash screens might get cut a bit... entirely theme and splash dependant.. if there is a problematic one we can look at it later.
- hopefully nothing more than very minor screen flickerings... let me know exactly where they are so they can be fixed

New GUI screen rules:
* Screens assume that the theme (sbs+ui viewport+ maybe background image) are always enabled. They may be disabled on a per display basis, but MUST be re-enabled on exit
* Screens must not be coded in a way that requires a statusbar of any type.. the inbuilt bar will be removed shortly.
ALWAYS RESPECT THE USERS SETTINGS unless the screen requires the full display to fit.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23904 a1c6a512-1295-4272-9138-f99709370657

apps/menus/theme_menu.c

@@ -49,7 +49,6 @@ static int clear_main_backdrop(void)
     global_settings.backdrop_file[0]=0;
     backdrop_unload(BACKDROP_MAIN);
     backdrop_show(BACKDROP_MAIN);
-    send_event(GUI_EVENT_REFRESH, NULL);
     settings_save();
     return 0;
 }
@@ -164,11 +163,6 @@ static int statusbar_callback_ex(int action,const struct menu_item_ex *this_item
         case ACTION_EXIT_MENUITEM:
             send_event(GUI_EVENT_STATUSBAR_TOGGLE, NULL);
             send_event(GUI_EVENT_ACTIONUPDATE, (void*)true);
-            if ((old_bar[screen] == STATUSBAR_CUSTOM)
-                || (statusbar_position(screen) == STATUSBAR_CUSTOM))
-                send_event(GUI_EVENT_REFRESH, NULL);
-            else
-                gui_statusbar_changed(screen, old_bar[screen]);
             break;
     }
     return ACTION_REDRAW;