- Added C# 7 test to validate questionable features work end-to-end.
- Had to add several explicit package references to let our VS specific packages work as expected.
#1046
VS has gone RTM so, updating to the RTM versions of those dependencies.
Roslyn does not publish our shim packages on NuGet.org, so updating those
to a non-ancient version for projects that use 2.0.0. The projects that
use 1.3.x are staying put for now.
The code change is dealing with something that was obsoleted.