migration symfony 5 4 (#300)

* symfony 5.4 (diff dev)

* symfony 5.4 (working)

* symfony 5.4 (update autoload)

* symfony 5.4 (remove swiftmailer mailer implementation)

* symfony 5.4 (php doc and split Global accessor class)


### Impacted packages:

composer require php:">=7.2.5 <8.0.0" symfony/console:5.4.* symfony/dotenv:5.4.* symfony/framework-bundle:5.4.* symfony/twig-bundle:5.4.* symfony/yaml:5.4.* --update-with-dependencies

composer require symfony/stopwatch:5.4.* symfony/web-profiler-bundle:5.4.* --dev --update-with-dependencies

lib/symfony/http-kernel/DataCollector/RouterDataCollector.php

@@ -14,17 +14,15 @@ namespace Symfony\Component\HttpKernel\DataCollector;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpKernel\Event\FilterControllerEvent;
+use Symfony\Component\HttpKernel\Event\ControllerEvent;
 
 /**
- * RouterDataCollector.
- *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class RouterDataCollector extends DataCollector
 {
     /**
-     * @var \SplObjectStorage
+     * @var \SplObjectStorage<Request, callable>
      */
     protected $controllers;
 
@@ -35,8 +33,10 @@ class RouterDataCollector extends DataCollector
 
     /**
      * {@inheritdoc}
+     *
+     * @final
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response, \Throwable $exception = null)
     {
         if ($response instanceof RedirectResponse) {
             $this->data['redirect'] = true;
@@ -69,7 +69,7 @@ class RouterDataCollector extends DataCollector
     /**
      * Remembers the controller associated to each request.
      */
-    public function onKernelController(FilterControllerEvent $event)
+    public function onKernelController(ControllerEvent $event)
     {
         $this->controllers[$event->getRequest()] = $event->getController();
     }
@@ -83,7 +83,7 @@ class RouterDataCollector extends DataCollector
     }
 
     /**
-     * @return string|null The target URL
+     * @return string|null
      */
     public function getTargetUrl()
     {
@@ -91,7 +91,7 @@ class RouterDataCollector extends DataCollector
     }
 
     /**
-     * @return string|null The target route
+     * @return string|null
      */
     public function getTargetRoute()
     {