Refactor authentication system (#2602)

Make auth configuration available via UI, remove FOSUserBundle and SAML-Bundle dependency

src/EventSubscriber/EmailSubscriber.php

@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\EventSubscriber;
+
+use App\Event\EmailEvent;
+use App\Mail\KimaiMailer;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Event subscriber to handle emails.
+ */
+final class EmailSubscriber implements EventSubscriberInterface
+{
+    private $mailer;
+
+    public function __construct(KimaiMailer $mailer)
+    {
+        $this->mailer = $mailer;
+    }
+
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            EmailEvent::class => ['onMailEvent', 100],
+        ];
+    }
+
+    public function onMailEvent(EmailEvent $event)
+    {
+        $this->mailer->send($event->getEmail());
+    }
+}