adding missing includes

VectoCore/VectoCore/Models/Declaration/CompletedBusSegments.cs

 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.IO;
 using System.Linq;
 using TUGraz.VectoCommon.BusAuxiliaries;
 using TUGraz.VectoCommon.Exceptions;

VectoCore/VectoCore/Models/Declaration/PrimaryBusSegments.cs

 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.IO;
 using System.Linq;
 using TUGraz.VectoCommon.BusAuxiliaries;
 using TUGraz.VectoCommon.Models;

VectoCore/VectoCore/Models/Declaration/TruckSegments.cs

@@ -32,6 +32,7 @@
 using System;
 using System.Collections.Generic;
 using System.Data;
+using System.IO;
 using System.Linq;
 using TUGraz.VectoCommon.Exceptions;
 using TUGraz.VectoCommon.Models;