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/libs/Twig/Error/SyntaxError.php

@@ -0,0 +1,57 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ * (c) Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Error;
+
+/**
+ * \Exception thrown when a syntax error occurs during lexing or parsing of a template.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class SyntaxError extends Error
+{
+    /**
+     * Tweaks the error message to include suggestions.
+     *
+     * @param string $name  The original name of the item that does not exist
+     * @param array  $items An array of possible items
+     */
+    public function addSuggestions($name, array $items)
+    {
+        if (!$alternatives = self::computeAlternatives($name, $items)) {
+            return;
+        }
+
+        $this->appendMessage(sprintf(' Did you mean "%s"?', implode('", "', $alternatives)));
+    }
+
+    /**
+     * @internal
+     *
+     * To be merged with the addSuggestions() method in 2.0.
+     */
+    public static function computeAlternatives($name, $items)
+    {
+        $alternatives = [];
+        foreach ($items as $item) {
+            $lev = levenshtein($name, $item);
+            if ($lev <= \strlen($name) / 3 || false !== strpos($item, $name)) {
+                $alternatives[$item] = $lev;
+            }
+        }
+        asort($alternatives);
+
+        return array_keys($alternatives);
+    }
+}
+
+class_alias('Twig\Error\SyntaxError', 'Twig_Error_Syntax');