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/console/Completion/Output/BashCompletionOutput.php

@@ -0,0 +1,33 @@
+<?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\Console\Completion\Output;
+
+use Symfony\Component\Console\Completion\CompletionSuggestions;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @author Wouter de Jong <wouter@wouterj.nl>
+ */
+class BashCompletionOutput implements CompletionOutputInterface
+{
+    public function write(CompletionSuggestions $suggestions, OutputInterface $output): void
+    {
+        $values = $suggestions->getValueSuggestions();
+        foreach ($suggestions->getOptionSuggestions() as $option) {
+            $values[] = '--'.$option->getName();
+            if ($option->isNegatable()) {
+                $values[] = '--no-'.$option->getName();
+            }
+        }
+        $output->writeln(implode("\n", $values));
+    }
+}