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/TwigTest.php

@@ -0,0 +1,87 @@
+<?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;
+
+/**
+ * Represents a template test.
+ *
+ * @final
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TwigTest
+{
+    protected $name;
+    protected $callable;
+    protected $options;
+
+    private $arguments = [];
+
+    public function __construct($name, $callable, array $options = [])
+    {
+        $this->name = $name;
+        $this->callable = $callable;
+        $this->options = array_merge([
+            'is_variadic' => false,
+            'node_class' => '\Twig\Node\Expression\TestExpression',
+            'deprecated' => false,
+            'alternative' => null,
+        ], $options);
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getCallable()
+    {
+        return $this->callable;
+    }
+
+    public function getNodeClass()
+    {
+        return $this->options['node_class'];
+    }
+
+    public function isVariadic()
+    {
+        return $this->options['is_variadic'];
+    }
+
+    public function isDeprecated()
+    {
+        return (bool) $this->options['deprecated'];
+    }
+
+    public function getDeprecatedVersion()
+    {
+        return $this->options['deprecated'];
+    }
+
+    public function getAlternative()
+    {
+        return $this->options['alternative'];
+    }
+
+    public function setArguments($arguments)
+    {
+        $this->arguments = $arguments;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+}
+
+class_alias('Twig\TwigTest', 'Twig_SimpleTest');