Refactor authentication system (#2602)

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

config/routes/annotations.yaml

@@ -12,7 +12,16 @@ app.api:
     type: rest
     prefix: /api
 
-security:
+auth:
     resource: '../../src/Controller/Auth/'
     type: annotation
     prefix: /auth
+
+security:
+    resource: '../../src/Controller/Security/'
+    type: annotation
+    prefix: /{_locale}
+    requirements:
+        _locale: '%app_locales%'
+    defaults:
+        _locale: '%locale%'