kpm pack should also nupkg the project dependencies

[loudej]

After copying the source projects to the target location.

Do the k build on the source projects to generate the nupkg for each. Source packages should be built innermost-first from a dependency standpoint.

Expand those newly built nupkgs into the target packages folder. These expanded packages must be favored over the source project when calculating dependency versions.

[lodejard]

@glennc this is one of the two features we just talked about, actual implementation may be different than what is described, but in general it's the ability for a source project in the input to kpm pack becomes a package project in the output