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/ExceptionDataCollector.php

@@ -11,25 +11,25 @@
 
 namespace Symfony\Component\HttpKernel\DataCollector;
 
-use Symfony\Component\Debug\Exception\FlattenException;
+use Symfony\Component\ErrorHandler\Exception\FlattenException;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 
 /**
- * ExceptionDataCollector.
- *
  * @author Fabien Potencier <fabien@symfony.com>
+ *
+ * @final
  */
 class ExceptionDataCollector extends DataCollector
 {
     /**
      * {@inheritdoc}
      */
-    public function collect(Request $request, Response $response, \Exception $exception = null)
+    public function collect(Request $request, Response $response, \Throwable $exception = null)
     {
         if (null !== $exception) {
             $this->data = [
-                'exception' => FlattenException::create($exception),
+                'exception' => FlattenException::createFromThrowable($exception),
             ];
         }
     }
@@ -42,19 +42,12 @@ class ExceptionDataCollector extends DataCollector
         $this->data = [];
     }
 
-    /**
-     * Checks if the exception is not null.
-     *
-     * @return bool true if the exception is not null, false otherwise
-     */
-    public function hasException()
+    public function hasException(): bool
     {
         return isset($this->data['exception']);
     }
 
     /**
-     * Gets the exception.
-     *
      * @return \Exception|FlattenException
      */
     public function getException()
@@ -62,42 +55,22 @@ class ExceptionDataCollector extends DataCollector
         return $this->data['exception'];
     }
 
-    /**
-     * Gets the exception message.
-     *
-     * @return string The exception message
-     */
-    public function getMessage()
+    public function getMessage(): string
     {
         return $this->data['exception']->getMessage();
     }
 
-    /**
-     * Gets the exception code.
-     *
-     * @return int The exception code
-     */
-    public function getCode()
+    public function getCode(): int
     {
         return $this->data['exception']->getCode();
     }
 
-    /**
-     * Gets the status code.
-     *
-     * @return int The status code
-     */
-    public function getStatusCode()
+    public function getStatusCode(): int
     {
         return $this->data['exception']->getStatusCode();
     }
 
-    /**
-     * Gets the exception trace.
-     *
-     * @return array The exception trace
-     */
-    public function getTrace()
+    public function getTrace(): array
     {
         return $this->data['exception']->getTrace();
     }
@@ -105,7 +78,7 @@ class ExceptionDataCollector extends DataCollector
     /**
      * {@inheritdoc}
      */
-    public function getName()
+    public function getName(): string
     {
         return 'exception';
     }