Update Twig from 1.35.0 to 1.42.4 (PHP 5.5 is now required!)

This fixes some errors on PHP 7.4 and contains even more fixes
Also bumped PHP version to 5.5 as Twig requires it.

common.php

@@ -23,7 +23,7 @@
  * @copyright 2019 MyAAC
  * @link      https://my-aac.org
  */
-if (version_compare(phpversion(), '5.3.3', '<')) die('PHP version 5.3.3 or higher is required.');
+if (version_compare(phpversion(), '5.5', '<')) die('PHP version 5.5 or higher is required.');
 session_start();
 
 define('MYAAC', true);