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/User/EquatableInterface.php

@@ -0,0 +1,30 @@
+<?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\User;
+
+/**
+ * EquatableInterface used to test if two objects are equal in security
+ * and re-authentication context.
+ *
+ * @author Dariusz Górecki <darek.krk@gmail.com>
+ */
+interface EquatableInterface
+{
+    /**
+     * The equality comparison should neither be done by referential equality
+     * nor by comparing identities (i.e. getId() === getId()).
+     *
+     * However, you do not need to compare every attribute, but only those that
+     * are relevant for assessing whether re-authentication is required.
+     */
+    public function isEqualTo(UserInterface $user): bool;
+}