/**
  *set the allowed shortcodes
  **/
 static function allowed_shortcodes($params, $remove = false)
 {
     if (!$remove) {
         self::$manually_allowed_shortcodes = $params;
         if (!in_array('av_textblock', self::$manually_allowed_shortcodes)) {
             self::$manually_allowed_shortcodes[] = 'av_textblock';
         }
     } else {
         self::$manually_disallowed_shortcodes = $params;
     }
 }