Plumb speculative model through to analyzers. Expand the tests of the speculative model to show both inputs to the nullable walker and inferences from the nullable walker in the speculated code.

* Added fsharp shims over document diagnostic analyzers

* Added shims for completion and sig help. Also added tests.

* Moved around internal files. Added shim over InlineRenameService.

* Starting shim over document highlights service. Added a better way to handle diagnostics

* Added shim for document highlights service

* Added IFSharpDocumentNavigationService

* Added IFSharpGoToDefinitionService

* Added IFSharpNavigationBarItemService

* Added IFSharpNavigateToSearchService

* Added extra glyph case

* Added FSharpGlyphTags

* Added FSharpCommentSelectionService

* Some cleanup. Added FSharpBlockStructureService

* Added some simple statics

* Finishing the last of shims

* Getting analyzers to work

* Remove folder

* Changes due to feedback

* Fixing build

* Still trying to fix build

* Fixed guid

* Fixing build again

* Filter out missing import fixes that would add references

* Remove superfluous IsEmpty check

* Update publish data for 16.2-preview3 snap

* Update PublishData.json

Pass arguments to StreamJsonRpc as arrays

🐛 Fix incorrect caching of XML documentation comments with/without expandIncludes

Handle missing private metadata from reference assemblies

Avoid captures in SqlConnection.FlushSpecificWritesAsync

* Use ref locals to simplify code flow
* Fix VB code layout

Some reference assemblies omit information about private fields. To
avoid treating structures in these assemblies as immutable, we only
consider types immutable if they contain information about one or more
private fields.

This is a workaround for issues like dotnet/standard#678.

Add missing editor configuration properties

IsCompletionActive returns false when no text view is active

Works around microsoft/vs-streamjsonrpc#272

Simplify representation of AttributeLists/Modifiers on all MemberDecls.

Do not qualify instance member access within a constructor initializer

Avoid in-process captures in UpdateReferencesAync

Wait for project system before waiting for workspace

* Ctor refactoring

* Renames

* Renames

* Cleanup

* ProjectExternalErrorReporter ctor

* Refactoring

* Remove dependency on VS

* Aggregation improvements

* Use ordinal comparer for project names

* Construct ProjectExternalErrorReporter lazily

* Fix off by one

* Fix issues

* Wip

* Update more pages

* Formatting

* Respond to feedback

* Add spacing to Formatting General page

* Get SVsSolution service instead of IVsSolution

* Use the correct GetService overload

Simplify x64 configuration for AnalyzerRunner

Enable preview SDKs for CI builds

this particular code path can take a long time if metadata reference hasn't created its symbols yet.

this can get really bad if we try to show code lens for something like IDispose.Dipose and it tries to create all metdata references in the solution.

since it is not cancellable, just passing by a Dipose method can cause this to occupy CPU 100% for several seconds and there is no way to make it go away.

now we pass in cancellation token so that we can bail out  sooner.