Added National Highways dataset#285

Merged

FraserGreenroyd merged 4 commits intomainfrom

LifeCycleAssessment_Toolkit-#-284-AddDatasetFromNationalHighaysCarbonTool

Nov 24, 2022

Commits on Oct 27, 2022

Add National Highways dataset
peterjamesnugent
committed
Restructured the datasets to fewer categories, added phases and included conversion factors
peterjamesnugent
committed

Commits on Nov 10, 2022

Update dataset to v2.5, normalise carbon factors to SI units and use Energy eNum
peterjamesnugent
committed

Commits on Nov 16, 2022

Added switch case for Energy QuantityType
peterjamesnugent
committed