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/FormRegistryInterface.php

@@ -0,0 +1,46 @@
+<?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;
+
+/**
+ * The central registry of the Form component.
+ *
+ * @author Bernhard Schussek <bschussek@gmail.com>
+ */
+interface FormRegistryInterface
+{
+    /**
+     * Returns a form type by name.
+     *
+     * This methods registers the type extensions from the form extensions.
+     *
+     * @throws Exception\InvalidArgumentException if the type cannot be retrieved from any extension
+     */
+    public function getType(string $name): ResolvedFormTypeInterface;
+
+    /**
+     * Returns whether the given form type is supported.
+     */
+    public function hasType(string $name): bool;
+
+    /**
+     * Returns the guesser responsible for guessing types.
+     */
+    public function getTypeGuesser(): ?FormTypeGuesserInterface;
+
+    /**
+     * Returns the extensions loaded by the framework.
+     *
+     * @return FormExtensionInterface[]
+     */
+    public function getExtensions(): array;
+}