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/ControllerMetadata/ArgumentMetadataFactoryInterface.php

@@ -19,7 +19,7 @@ namespace Symfony\Component\HttpKernel\ControllerMetadata;
 interface ArgumentMetadataFactoryInterface
 {
     /**
-     * @param mixed $controller The controller to resolve the arguments for
+     * @param string|object|array $controller The controller to resolve the arguments for
      *
      * @return ArgumentMetadata[]
      */