replaced mailer library, added email templates (#1462)

src/Mail/KimaiMailer.php

@@ -0,0 +1,43 @@
+<?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\Mail;
+
+use App\Configuration\MailConfiguration;
+use Symfony\Component\Mailer\Envelope;
+use Symfony\Component\Mailer\MailerInterface;
+use Symfony\Component\Mime\Email;
+use Symfony\Component\Mime\RawMessage;
+
+final class KimaiMailer implements MailerInterface
+{
+    /**
+     * @var MailerInterface
+     */
+    private $mailer;
+    /**
+     * @var MailConfiguration
+     */
+    private $configuration;
+
+    public function __construct(MailConfiguration $configuration, MailerInterface $mailer)
+    {
+        $this->configuration = $configuration;
+        $this->mailer = $mailer;
+    }
+
+    public function send(RawMessage $message, Envelope $envelope = null): void
+    {
+        if ($message instanceof Email) {
+            $message->from($this->configuration->getFromAddress());
+        }
+
+        $this->mailer->send($message);
+    }
+}