Merge master to features/NativeInt

Do not offer to rename files/types to match when there's no type name available

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.19608.1

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.19607.1

Merge release/dev16.4 to master

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.19606.1

Merge release/dev16.4 to master

* EnC: Use the current document encoding when reading source text from file.

* Optimization

Fix AddImports codefix on implicit extension methods

Merge release/dev16.4 to master

Revert "Move to new API for GetSuggestedActions"

Consolidate C# and VB language servers into one implementation

* Update dependencies from https://github.com/dotnet/arcade build 20191205.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19605.2

* Pack Content for anlyzer packages

* Skip failing C# REPL integration tests.

After CI image was updated with 16.4 Preview 5 some REPL tests started
failing consistently. https://github.com/dotnet/roslyn/issues/40160

* Skip additional test

* EnC: Use the current document encoding when reading source text from file.

* Optimization

* Update dependencies from https://github.com/dotnet/arcade build 20191204.4

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.19604.4

* Update dependencies from https://github.com/dotnet/arcade build 20191205.6

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.19605.6

Avoid going into an infinite cycle while resolving erroneous event/property implementation within an interface (#40175)

Fixes https://dev.azure.com/devdiv/DevDiv/_workitems/edit/1029574.

* Document load failures

* Delete WorkspaceFailureOutputPane

* Remove dead code

* MSBuildWorkspace cleanup

Co-Authored-By: NSam Harwell <sam@tunnelvisionlabs.com>

Move to new API for GetSuggestedActions

Merge branch 'master-vs-deps' to master

Fixes #39888

Skip failing C# REPL integration tests.

Fixes #40043