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/ChoiceList/Loader/CallbackChoiceLoader.php

@@ -0,0 +1,35 @@
+<?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\ChoiceList\Loader;
+
+/**
+ * Loads an {@link ArrayChoiceList} instance from a callable returning iterable choices.
+ *
+ * @author Jules Pietri <jules@heahprod.com>
+ */
+class CallbackChoiceLoader extends AbstractChoiceLoader
+{
+    private \Closure $callback;
+
+    /**
+     * @param callable $callback The callable returning iterable choices
+     */
+    public function __construct(callable $callback)
+    {
+        $this->callback = $callback(...);
+    }
+
+    protected function loadChoices(): iterable
+    {
+        return ($this->callback)();
+    }
+}