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/Extension/Validator/ViolationMapper/RelativePath.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\Extension\Validator\ViolationMapper;
+
+use Symfony\Component\Form\FormInterface;
+use Symfony\Component\PropertyAccess\PropertyPath;
+
+/**
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+class RelativePath extends PropertyPath
+{
+    private FormInterface $root;
+
+    public function __construct(FormInterface $root, string $propertyPath)
+    {
+        parent::__construct($propertyPath);
+
+        $this->root = $root;
+    }
+
+    public function getRoot(): FormInterface
+    {
+        return $this->root;
+    }
+}