Refactor authentication system (#2602)

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

composer.json

@@ -27,11 +27,9 @@
         "friendsofsymfony/rest-bundle": "^3.0",
         "gedmo/doctrine-extensions": "^3.0",
         "handcraftedinthealps/rest-routing-bundle": "^1.0",
-        "hslavich/oneloginsaml-bundle": "^1.4",
         "jms/metadata": "^2.0",
         "jms/serializer-bundle": "^3.9",
-        "kevinpapst/adminlte-bundle": "^3.3",
-        "kimai/user-bundle": "^2.0",
+        "kevinpapst/adminlte-bundle": "dev-master",
         "laravolt/avatar": "^4.0",
         "league/csv": "^9.4",
         "league/html-to-markdown": "^5.0",