Refactor authentication system (#2602)

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

src/Saml/Token/SamlTokenInterface.php

@@ -0,0 +1,16 @@
+<?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\Saml\Token;
+
+use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
+
+interface SamlTokenInterface extends TokenInterface
+{
+}