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/polyfill-intl-icu/DateFormat/DayTransformer.php

@@ -0,0 +1,39 @@
+<?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\Polyfill\Intl\Icu\DateFormat;
+
+/**
+ * Parser and formatter for day format.
+ *
+ * @author Igor Wiedler <igor@wiedler.ch>
+ *
+ * @internal
+ */
+class DayTransformer extends Transformer
+{
+    public function format(\DateTime $dateTime, int $length): string
+    {
+        return $this->padLeft($dateTime->format('j'), $length);
+    }
+
+    public function getReverseMatchingRegExp(int $length): string
+    {
+        return 1 === $length ? '\d{1,2}' : '\d{1,'.$length.'}';
+    }
+
+    public function extractDateOptions(string $matched, int $length): array
+    {
+        return [
+            'day' => (int) $matched,
+        ];
+    }
+}