move Twig in 3rdparty

inc/3rdparty/Twig/Extensions/GrammarInterface.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+interface Twig_Extensions_GrammarInterface
+{
+    function setParser(Twig_ParserInterface $parser);
+
+    function parse(Twig_Token $token);
+
+    function getName();
+}