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.

system/functions.php

@@ -7,6 +7,9 @@
  * @copyright 2019 MyAAC
  * @link      https://my-aac.org
  */
+
+use Twig\Loader\ArrayLoader as Twig_ArrayLoader;
+
 defined('MYAAC') or die('Direct access not allowed!');
 
 function message($message, $type, $return)
@@ -1190,7 +1193,7 @@ function getCustomPage($page, &$success)
 		else {
 			$oldLoader = $twig->getLoader();
 
-			$twig_loader_array = new Twig_Loader_Array(array(
+			$twig_loader_array = new Twig_ArrayLoader(array(
 				'content.html' => $query['body']
 			));