start implementing multiple modes for operation

- synapse: Only trigger register calls and do not store anything for longterm
- local: Provide an identity store and register to the own backend

internal/identity_single.php

@@ -61,5 +61,5 @@ try {
         "error" => $e->getMessage()
     ];
 }
-print (json_encode($response, JSON_PRETTY_PRINT) . "\n");
+print (json_encode($response, JSON_PRETTY_PRINT));
 ?>