N°8771 - Add Symfony form component to iTop core (#760)

- Add Symfony Form Component
- Add Symfony CSRF security component
- Add iTop default form template
- Add Twig debug extension to Twig Environment
- Add iTop abstract controller facility to get form builder
- Add Twig filter to make trans an alias of dict_s filter

lib/symfony/security-core/Exception/TokenNotFoundException.php

@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Security\Core\Exception;
+
+/**
+ * TokenNotFoundException is thrown if a Token cannot be found.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ * @author Alexander <iam.asm89@gmail.com>
+ */
+class TokenNotFoundException extends AuthenticationException
+{
+    public function getMessageKey(): string
+    {
+        return 'No token could be found.';
+    }
+}