Replace VU meter menu with a new one using the new menu api, fixes some

problems:
* Up/Down buttons are no longer reversed.
* The menu looks much better with reversed bg/fg colors instead of 
inversed.
* Menu uses userfont.

Add the set_bool_options function to the plugin api and bump api 
version.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13629 a1c6a512-1295-4272-9138-f99709370657

apps/plugin.c

@@ -497,6 +497,7 @@ static const struct plugin_api rockbox_api = {
 #endif
     threads,
     create_numbered_filename,
+    set_bool_options,
 };
 
 int plugin_load(const char* plugin, void* parameter)