public static function usePlugin($pluginId)
 {
     if (self::$pluginUsed) {
         return false;
     }
     if ($pluginId == 'integrator') {
         self::$pluginUsed = $pluginId;
         return true;
     } else {
         if ($pluginId == 'visual-editor' && !self::findPlugin('integrator')) {
             self::$pluginUsed = $pluginId;
             return true;
         } else {
             if (!self::findPlugin('integrator') && !self::findPlugin('visual-editor')) {
                 self::$pluginUsed = $pluginId;
                 return true;
             }
         }
     }
     return false;
 }