Umstellung auf UTC Timestamp

lib/model/job.dart

@@ -18,7 +18,7 @@ class Job with ProducerMixin {
   @JsonKey(name: 'cr_filter')
   late String? crFilter;
   @JsonKey(name: 'ordertime')
-  late String ordertime;
+  late int ordertime;
   @JsonKey(name: 'offs_warn')
   late int offsWarn;
   @JsonKey(name: 'global')