Umstellung auf UTC Timestamp

lib/network_messages/track_station_message.g.dart

@@ -9,7 +9,7 @@ part of 'track_station_message.dart';
 TrackStationMessage _$TrackStationMessageFromJson(Map<String, dynamic> json) =>
     TrackStationMessage()
       ..sid = (json['s_id'] as num).toInt()
-      ..time = json['time'] as String
+      ..time = (json['time'] as num).toInt()
       ..pos = json['pos'] == null
           ? null
           : FinTaskPos.fromJson(json['pos'] as Map<String, dynamic>);