Co-authored-by: NCyrusNajmabadi <cyrus.najmabadi@gmail.com>
Co-authored-by: NDavid Wengier <dawengie@microsoft.com>

This moves the fetching of the nullable state into the first part of
quick info, which is figuring out the data/model. The function to take
that model and convert it to the display information can now go static
since it's not relying on other indirection.

variables of the desired type

None of this actually depended on the editor in any meaningful way.

* Add Solution.AnalyzerReferences

* HostDiagnosticAnalyzers

* Move types down to Workspaces

add localized text