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/TokenParser/UseTokenParser.php

@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\TokenParser;
+
+use Twig\Error\SyntaxError;
+use Twig\Node\Expression\ConstantExpression;
+use Twig\Node\Node;
+use Twig\Token;
+
+/**
+ * Imports blocks defined in another template into the current template.
+ *
+ *    {% extends "base.html" %}
+ *
+ *    {% use "blocks.html" %}
+ *
+ *    {% block title %}{% endblock %}
+ *    {% block content %}{% endblock %}
+ *
+ * @see https://twig.symfony.com/doc/templates.html#horizontal-reuse for details.
+ *
+ * @final
+ */
+class UseTokenParser extends AbstractTokenParser
+{
+    public function parse(Token $token)
+    {
+        $template = $this->parser->getExpressionParser()->parseExpression();
+        $stream = $this->parser->getStream();
+
+        if (!$template instanceof ConstantExpression) {
+            throw new SyntaxError('The template references in a "use" statement must be a string.', $stream->getCurrent()->getLine(), $stream->getSourceContext());
+        }
+
+        $targets = [];
+        if ($stream->nextIf('with')) {
+            do {
+                $name = $stream->expect(Token::NAME_TYPE)->getValue();
+
+                $alias = $name;
+                if ($stream->nextIf('as')) {
+                    $alias = $stream->expect(Token::NAME_TYPE)->getValue();
+                }
+
+                $targets[$name] = new ConstantExpression($alias, -1);
+
+                if (!$stream->nextIf(Token::PUNCTUATION_TYPE, ',')) {
+                    break;
+                }
+            } while (true);
+        }
+
+        $stream->expect(Token::BLOCK_END_TYPE);
+
+        $this->parser->addTrait(new Node(['template' => $template, 'targets' => new Node($targets)]));
+
+        return new Node();
+    }
+
+    public function getTag()
+    {
+        return 'use';
+    }
+}
+
+class_alias('Twig\TokenParser\UseTokenParser', 'Twig_TokenParser_Use');