Umstellung auf UTC Timestamp

lib/network_messages/logout_message.g.dart

@@ -20,7 +20,7 @@ Map<String, dynamic> _$LogoutMessageToJson(LogoutMessage instance) =>
 LogoutMessagePosition _$LogoutMessagePositionFromJson(
         Map<String, dynamic> json) =>
     LogoutMessagePosition()
-      ..time = json['time'] as String
+      ..time = (json['time'] as num).toInt()
       ..lat = (json['lat'] as num).toDouble()
       ..long = (json['long'] as num).toDouble()
       ..acc = (json['acc'] as num).toInt();