Resolves #33344

Relates to #29821
Fixes #34409

Merge liveshare changes to do dual insertion.

* Update dependencies from https://github.com/dotnet/arcade build 20190711.7

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19361.7

* Update dependencies from https://github.com/dotnet/arcade build 20190712.5

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19362.5

* Update dependencies from https://github.com/dotnet/arcade build 20190713.1

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19363.1

Show infobar for recommending installation of FxCopAnalyzers NuGet/VSIX

Address PR feedback and add an internal abstract property `SyntaxEditorBasedCodeFixProvider.CodeFixCategory` to determine the category of code fixes offered by our code fixers.

Completion timebox

Fixes #29819

Move refactorings to common helpers

Move 'Wrapping' code actions down to 'Feature' layer.

* Top-level types enumeration refactoring

* Simplify DefinitionMap

* Include namespaces in synthesized definition map

* Add SynthesizedNamespaceSymbol

* Embedded Attributes

* Test synthesized attributes

* Clean up EnC tests

* Clean up symbol matcher tests

* Ref readonly return type, in parameter symbol matching tests

* Enable using ref readonly returns, in parameters, ref structs during debugging

* More tests

* ReadOnly struct members

* Fix langauge version mismatch

* Merge fix ups

* Feedback, skip tests

Rename TypeArgumentsNullableAnnotations to TypeArgumentNullableAnnotations

* dotnet/master:
  Fix master build (#37163)
  Add error for multiple null suppressions (#37139)
  Check for uninitialized non-nullable field-like events (#37073)
  EnC emit tests for C# 8.0 patterns (#37025)
  Update dependencies from https://github.com/dotnet/arcade build 20190710.8
  Update dependencies from https://github.com/dotnet/arcade build 20190709.6
  [master] Update dependencies from dotnet/arcade (#37001)
  Add annotations to HostWorkspaceServices.cs and HostLanguageServices.cs
  Add nullable annotations to members in Solution.cs, SolutionInfo.cs, and SolutionState.cs
  Annotate Contract.cs
  Add nullable annotations and fixes to Workspace.cs
  Fix typo in documentation comment for Workspace.Dispose
  Check in copy of NullableAttributes.cs copied from coreclr
  Use switch expressions to simplify GetAccessibilityAndModifiers

[master] Update dependencies from dotnet/arcade

Use switch expressions to simplify GetAccessibilityAndModifiers

Fixes #37111

Fixes #30067

* EnC LocalSlotMappingTests for C# 8.0 patterns
* PDBTest
* EditAndContinueTest

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19360.8

Add nullable annotations to parts of the Workspace API