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-access/CHANGELOG.md

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+CHANGELOG
+=========
+
+6.3
+---
+
+ * Allow escaping `.` and `[` with `\` in `PropertyPath`
+
+6.2
+---
+
+ * Deprecate calling `PropertyAccessorBuilder::setCacheItemPool()` without arguments
+ * Added method `isNullSafe()` to `PropertyPathInterface`, implementing the interface without implementing this method
+   is deprecated
+ * Add support for the null-coalesce operator in property paths
+
+6.0
+---
+
+ * make `PropertyAccessor::__construct()` accept a combination of bitwise flags as first and second arguments
+
+5.3.0
+-----
+
+ * deprecate passing a boolean as the second argument of `PropertyAccessor::__construct()`, expecting a combination of bitwise flags instead
+
+5.2.0
+-----
+
+ * deprecated passing a boolean as the first argument of `PropertyAccessor::__construct()`, expecting a combination of bitwise flags instead
+ * added the ability to disable usage of the magic `__get` & `__set` methods
+
+5.1.0
+-----
+
+ * Added an `UninitializedPropertyException`
+ * Linking to PropertyInfo extractor to remove a lot of duplicate code
+
+4.4.0
+-----
+
+ * deprecated passing `null` as `$defaultLifetime` 2nd argument of `PropertyAccessor::createCache()` method,
+   pass `0` instead
+
+4.3.0
+-----
+
+ * added a `$throwExceptionOnInvalidPropertyPath` argument to the PropertyAccessor constructor.
+ * added `enableExceptionOnInvalidPropertyPath()`, `disableExceptionOnInvalidPropertyPath()` and
+   `isExceptionOnInvalidPropertyPath()` methods to `PropertyAccessorBuilder`
+
+4.0.0
+-----
+
+ * removed the `StringUtil` class, use `Symfony\Component\Inflector\Inflector`
+
+3.1.0
+-----
+
+ * deprecated the `StringUtil` class, use `Symfony\Component\Inflector\Inflector`
+   instead
+
+2.7.0
+------
+
+ * `UnexpectedTypeException` now expects three constructor arguments: The invalid property value,
+   the `PropertyPathInterface` object and the current index of the property path.
+
+2.5.0
+------
+
+ * allowed non alpha numeric characters in second level and deeper object properties names
+ * [BC BREAK] when accessing an index on an object that does not implement
+   ArrayAccess, a NoSuchIndexException is now thrown instead of the
+   semantically wrong NoSuchPropertyException
+ * [BC BREAK] added isReadable() and isWritable() to PropertyAccessorInterface
+
+2.3.0
+------
+
+ * added PropertyAccessorBuilder, to enable or disable the support of "__call"
+ * added support for "__call" in the PropertyAccessor (disabled by default)
+ * [BC BREAK] changed PropertyAccessor to continue its search for a property or
+   method even if a non-public match was found. Before, a PropertyAccessDeniedException
+   was thrown in this case. Class PropertyAccessDeniedException was removed
+   now.
+ * deprecated PropertyAccess::getPropertyAccessor
+ * added PropertyAccess::createPropertyAccessor and PropertyAccess::createPropertyAccessorBuilder