UE4.20 is missing the IntelliSense IncludePath for the *.generated.h files

I also had to add the following paths:

C:\Program Files\Epic Games\UE_4.20\Engine\Intermediate\Build\Win64\UE4\Inc\Engine
C:\Program Files\Epic Games\UE_4.20\Engine\Intermediate\Build\Win64\UE4\Inc\InputCore