Use Features On Demand instead of installing CAB files where possible

[lbussell]

In some cases, we can use Features On Demand to install features where we used to install CAB files directly. For example, to install .NET Framework 3 from Windows Update:

DISM /Online /Add-Capability /CapabilityName:NetFx3

We should evaluate which Windows versions support Features On Demand and consider applying this approach retroactively to the applicable .NET Framework Dockerfiles.

[lbussell]

To discover capabilities available for an image, you can run DISM /Online /Get-Capabilities.

[lbussell]

We now use FoD/DISM to install the NetFx3 feature in all .NET Framework 3.5 images. #1220