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/Node/EmbedNode.php

@@ -0,0 +1,52 @@
+<?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\Node;
+
+use Twig\Compiler;
+use Twig\Node\Expression\AbstractExpression;
+use Twig\Node\Expression\ConstantExpression;
+
+/**
+ * Represents an embed node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class EmbedNode extends IncludeNode
+{
+    // we don't inject the module to avoid node visitors to traverse it twice (as it will be already visited in the main module)
+    public function __construct($name, $index, AbstractExpression $variables = null, $only = false, $ignoreMissing = false, $lineno, $tag = null)
+    {
+        parent::__construct(new ConstantExpression('not_used', $lineno), $variables, $only, $ignoreMissing, $lineno, $tag);
+
+        $this->setAttribute('name', $name);
+        // to be removed in 2.0, used name instead
+        $this->setAttribute('filename', $name);
+        $this->setAttribute('index', $index);
+    }
+
+    protected function addGetTemplate(Compiler $compiler)
+    {
+        $compiler
+            ->write('$this->loadTemplate(')
+            ->string($this->getAttribute('name'))
+            ->raw(', ')
+            ->repr($this->getTemplateName())
+            ->raw(', ')
+            ->repr($this->getTemplateLine())
+            ->raw(', ')
+            ->string($this->getAttribute('index'))
+            ->raw(')')
+        ;
+    }
+}
+
+class_alias('Twig\Node\EmbedNode', 'Twig_Node_Embed');