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/form/Event/PostSubmitEvent.php

@@ -0,0 +1,33 @@
+<?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\Form\Event;
+
+use Symfony\Component\Form\FormEvent;
+
+/**
+ * This event is dispatched after the Form::submit()
+ * once the model and view data have been denormalized.
+ *
+ * It can be used to fetch data after denormalization.
+ */
+final class PostSubmitEvent extends FormEvent
+{
+    /**
+     * @deprecated since Symfony 6.4, it will throw an exception in 7.0.
+     */
+    public function setData(mixed $data): void
+    {
+        trigger_deprecation('symfony/form', '6.4', 'Calling "%s()" will throw an exception as of 7.0, listen to "form.pre_submit" or "form.submit" instead.', __METHOD__);
+        // throw new BadMethodCallException('Form data cannot be changed during "form.post_submit", you should use "form.pre_submit" or "form.submit" instead.');
+        parent::setData($data);
+    }
+}