Simplify the code for filtering find refs results and testing them.

Change INavigableItem to support classified presentation.

IsEnglishLocal checks CurrentCulture and CurrentUICulture

Merging branch 'features/test-impact' into 'master'

Rename feature flag used for exercising V7 switch binder with V6 switches

Changes resulted from reimplementing tuples in VB

Removed a "PROTOTYPE" from a comment.

Microsoft.CodeAnalysis.Metadata and Microsoft.CodeAnalysis.PooledObjects

Implement Move type to file refactoring

Reorganize FAR code slightly to make adding streaming-FAR support in easier.

Add a fileIndex parameter to CreatePayload for dynamic analysis.

Move classification helper code so it will be usable by the new async find refs service.

Remove unused FindAllReferences method.

Navigable items can state if they are relate to implicitly declared items or not.  We want this as we will not display unreference implicitly declared nav items.

* Enable building and testing on machines with only Dev15 Preview 3 installed

1. Auto-detect the VS common tools path
2. Convert analyzer samples to import Roslyn targets
3. Ensure dependencies are copied to the output directory
4. Workaround: Use local Microsoft.Net.Compilers.props until we move to a compiler toolset with https://github.com/dotnet/roslyn/commit/05c12ebfcdd08a02dbceded5327a8da7a7df23be
5. Replace references to Microsoft.VisualStudio.ComponentModelHost.dll (VisualStudioReferenceAssemblyVersion) with a nuget reference to RoslynDependencies.Microsoft.VisualStudio.ComponentModelHost
6. Add nuget references to Roslyn.Microsoft.Build, Roslyn.Microsoft.VisualStudio.ExtensionManager, RoslynDependencies.Microsoft.VisualStudio.Diagnostics.PerformanceProvider and RoslynDependencies.Microsoft.VisualStudio.CodeAnalysis.Sdk.UI.

* Remove workaround now that new NuGet packages have been uploaded to nuget.org

* Remove preprocessor directive MSBUILD12 and its references

Merge dev15-preview-4 into master

.. code actions for a refactoring.

Remove quick info parameters that were never used.

.. after merge..

We didn't offer move type to new file if there was a single outer type
in a document with a nested type in it. Move to new file should be
offered for the nested type here.