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/ReversedTransformer.php

@@ -0,0 +1,40 @@
+<?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;
+
+/**
+ * Reverses a transformer.
+ *
+ * When the transform() method is called, the reversed transformer's
+ * reverseTransform() method is called and vice versa.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class ReversedTransformer implements DataTransformerInterface
+{
+    protected $reversedTransformer;
+
+    public function __construct(DataTransformerInterface $reversedTransformer)
+    {
+        $this->reversedTransformer = $reversedTransformer;
+    }
+
+    public function transform(mixed $value): mixed
+    {
+        return $this->reversedTransformer->reverseTransform($value);
+    }
+
+    public function reverseTransform(mixed $value): mixed
+    {
+        return $this->reversedTransformer->transform($value);
+    }
+}