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/property-info/PropertyDescriptionExtractorInterface.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\PropertyInfo;
+
+/**
+ * Guesses the property's human readable description.
+ *
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+interface PropertyDescriptionExtractorInterface
+{
+    /**
+     * Gets the short description of the property.
+     */
+    public function getShortDescription(string $class, string $property, array $context = []): ?string;
+
+    /**
+     * Gets the long description of the property.
+     */
+    public function getLongDescription(string $class, string $property, array $context = []): ?string;
+}