The roots to package directories
     This points to the root of each located package.
     The layout of the package manager will be package manager specific.
     however, the dependency manager dll understands the nuget package layout
     and so if the package contains folders similar to the nuget layout then
     the dependency manager will be able to probe and resolve any native dependencies
     required by the nuget package.

 This path is also equivalent to
     #I @"c:\somepath\to\packages\1.1.1\ResolvedPackage"