removed some net45 specific code

VectoCore/VectoCore/InputData/Reader/DataObjectAdapter/PrimaryBus/DeclarationDataAdapterPrimaryBus.cs

@@ -266,8 +266,7 @@ namespace TUGraz.VectoCore.InputData.Reader.DataObjectAdapter.PrimaryBus
 
 			#region Overrides of PrimaryBusBase
 
-			// ReSharper disable once UseArrayEmptyMethod //not supported in net45
-			public override GearboxType[] SupportedGearboxTypes => new GearboxType[0];
+			public override GearboxType[] SupportedGearboxTypes => Array.Empty<GearboxType>();
 
 			#endregion
 		}

VectoCore/VectoCore/OutputData/XML/GroupWriter/Declaration/Vehicle/Components/Auxiliaries/BusAuxHVACConventionalGroupWriter.cs

@@ -48,19 +48,9 @@ namespace TUGraz.VectoCore.OutputData.XML.GroupWriter.Declaration.Vehicle.Compon
 				.GetBusAuxiliariesDeclarationGroupWriter(GroupNames.BusAuxHVACHeatPumpSequenceGroup, _writerNamespace)
 				.GetGroupElements(aux);
 
-#if NET45
-			foreach (var e in groupElements) {
-				elements.Add(e);
-			}
-#else
 			elements.AddRange(groupElements);
 
-#endif
-
-
-
-
-            elements.Add(new XElement(_writerNamespace + XMLNames.Bus_AuxiliaryHeaterPower,
+			elements.Add(new XElement(_writerNamespace + XMLNames.Bus_AuxiliaryHeaterPower,
 				aux.HVACAux.AuxHeaterPower?.ToXMLFormat(0)));
 			elements.Add(new XElement(_writerNamespace + XMLNames.Bus_DoubleGlazing, aux.HVACAux.DoubleGlazing));
 			elements.Add(new XElement(_writerNamespace + XMLNames.Bus_AdjustableAuxiliaryHeater,