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/framework-bundle/Resources/config/debug_prod.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\Component\DependencyInjection\Loader\Configurator;
+
+use Symfony\Component\HttpKernel\Debug\FileLinkFormatter;
+use Symfony\Component\HttpKernel\EventListener\DebugHandlersListener;
+
+return static function (ContainerConfigurator $container) {
+    $container->parameters()->set('debug.error_handler.throw_at', -1);
+
+    $container->services()
+        ->set('debug.debug_handlers_listener', DebugHandlersListener::class)
+            ->args([
+                null, // Exception handler
+                service('monolog.logger.php')->nullOnInvalid(),
+                null, // Log levels map for enabled error levels
+                param('debug.error_handler.throw_at'),
+                param('kernel.debug'),
+                param('kernel.debug'),
+                service('monolog.logger.deprecation')->nullOnInvalid(),
+            ])
+            ->tag('kernel.event_subscriber')
+            ->tag('monolog.logger', ['channel' => 'php'])
+
+        ->set('debug.file_link_formatter', FileLinkFormatter::class)
+            ->args([param('debug.file_link_format')])
+
+        ->alias(FileLinkFormatter::class, 'debug.file_link_formatter')
+    ;
+};