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/EmbedTokenParser.php

@@ -0,0 +1,74 @@
+<?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\Node\EmbedNode;
+use Twig\Node\Expression\ConstantExpression;
+use Twig\Node\Expression\NameExpression;
+use Twig\Token;
+
+/**
+ * Embeds a template.
+ *
+ * @final
+ */
+class EmbedTokenParser extends IncludeTokenParser
+{
+    public function parse(Token $token)
+    {
+        $stream = $this->parser->getStream();
+
+        $parent = $this->parser->getExpressionParser()->parseExpression();
+
+        list($variables, $only, $ignoreMissing) = $this->parseArguments();
+
+        $parentToken = $fakeParentToken = new Token(Token::STRING_TYPE, '__parent__', $token->getLine());
+        if ($parent instanceof ConstantExpression) {
+            $parentToken = new Token(Token::STRING_TYPE, $parent->getAttribute('value'), $token->getLine());
+        } elseif ($parent instanceof NameExpression) {
+            $parentToken = new Token(Token::NAME_TYPE, $parent->getAttribute('name'), $token->getLine());
+        }
+
+        // inject a fake parent to make the parent() function work
+        $stream->injectTokens([
+            new Token(Token::BLOCK_START_TYPE, '', $token->getLine()),
+            new Token(Token::NAME_TYPE, 'extends', $token->getLine()),
+            $parentToken,
+            new Token(Token::BLOCK_END_TYPE, '', $token->getLine()),
+        ]);
+
+        $module = $this->parser->parse($stream, [$this, 'decideBlockEnd'], true);
+
+        // override the parent with the correct one
+        if ($fakeParentToken === $parentToken) {
+            $module->setNode('parent', $parent);
+        }
+
+        $this->parser->embedTemplate($module);
+
+        $stream->expect(Token::BLOCK_END_TYPE);
+
+        return new EmbedNode($module->getTemplateName(), $module->getAttribute('index'), $variables, $only, $ignoreMissing, $token->getLine(), $this->getTag());
+    }
+
+    public function decideBlockEnd(Token $token)
+    {
+        return $token->test('endembed');
+    }
+
+    public function getTag()
+    {
+        return 'embed';
+    }
+}
+
+class_alias('Twig\TokenParser\EmbedTokenParser', 'Twig_TokenParser_Embed');