Move certain Syntax querying APIs down from SyntaxGenerator to ISyntaxFacts. These APIs are used by accessibility related analyzers.

This change also requires explicitly linking in the public type DeclarationKind into CodeStyle layer.

Port UseObjectInitializer and UseCollectionInitializer analyzers/fixers…

Do not report unused parameters for trivial throw-only methods

Port UseExpressionBody analyzer/fixer/tests to shared layer

Fix SerializableOptionSet to preserve option changes for unrelated la…

Move RemoveUnnecessaryValuesAndParameters analyzer/fixer/tests to shared layer

Classify escape characters in char literals

Oops forgot to checkin the files that were removed when moving couple of language services to shared layer

Extract out some internal SyntaxGenerator methods into a separate language service in shared layer so it can be used by our code fixes. These methods can eventually be removed when we expose these as public APIs on SyntaxGenerator and CodeStyle layer can move to new CodeAnalysis package reference consume these new APIs.

* Add Razor shims to ExternalAccess.Razor.

- This is the first step to removing IVT to Razor assemblies from core Roslyn assemblies. Once Razor is able to consume these changes and move to the new APIs we can entirely remove the IVTs from Roslyn assemblies.
- Brought Razor's `IDynamicFileInfoProvider` implementation over to the ExternalAccess.Razor package and built a new concept (`IRazorDocumentContainer`) that allows Razor to pass it just enough information about the document to Roslyn for it to "do the right thing".

dotnet/aspnetcore#19551

* Refactored Razor.ExternalAccess to leave more logic in Razor.

- Now `IDynamicFileInfoProvider` is shimmed and the core-logic exists in the Razor repo.
- Added the ExternalAccess.Razor piece to the Roslyn deployment to ensure our `IDynamicFileInfoProvider` wrapper can be found by MEF components. In the case that the Razor workload is not available we allow a `null` Razor dynamic file implementation.
- Updated the ExternalAccess.Razor project to be netstandard2.0 instead of net472 so it vibes better with the Razor repo.

dotnet/aspnetcore#19551

* Turn nullable reference types on for ExternalAccess.Razor and make the DynamicFileInfoProvider not load Razor assemblies in non-Razor scenarios.

Disable test on CoreCLR

Only simplify interpolations when the alignment value is constant.

Current implementation was dropping all option changes to language specific options if there were no projects of that language in solution. Now we preserve such option changes.

Turn nullable reference types on for ExternalAccess.Razor and make the DynamicFileInfoProvider not load Razor assemblies in non-Razor scenarios.

* Update dependencies from https://github.com/dotnet/arcade build 20200309.2

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20159.2

* Update dependencies from https://github.com/dotnet/arcade build 20200310.4

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20160.4

* Update dependencies from https://github.com/dotnet/arcade build 20200311.5

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20161.5

* Update dependencies from https://github.com/dotnet/arcade build 20200312.3

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20162.3
Co-authored-by: Ndotnet-maestro[bot] <dotnet-maestro[bot]@users.noreply.github.com>

The CompareAllBytesEmitted tests need to be disabled on CoreCLR due to
a flakiness issue.

Add VSTypeScriptEditorInlineRenameService + associated classes