Quick info for inline parameter name hints

Diagnostics for CommitOnSave failures

Use C# 'not' pattern when available.

* Update System.Runtime.CompilerServices.Unsafe to 4.7.1

This brings it up to the latest stable version on nuget.org so we can keep updating other dependencies in VS without fear that they need a dependency that's newer than what VS ships.

* Update System.Threading.Tasks.Extensions to 4.5.4

This matches a VS update recently made: https://devdiv.visualstudio.com/DevDiv/_git/VS/pullrequest/265216?path=%2Fsrc%2FSetupPackages%2FCoreIde%2FMinShell%2Fcore%2Ffiles.swr&_a=commits

* Update System.Threading.Tasks.Dataflow and Microsoft.Bcl.AsyncInterfaces

These bring up more corefx assemblies to match the version inserted to VS as of https://devdiv.visualstudio.com/DevDiv/_git/VS/pullrequest/265216?path=%2Fsrc%2FSetupPackages%2FCoreIde%2FMinShell%2Fcore%2Ffiles.swr&_a=commits.

* Skip CommandLineRunnerTests.TestReferenceDirective
Co-authored-by: NRikki Gibson <rikkigibson@gmail.com>

Enable caching for LSP code actions

Added some padding to the left of the text - Inline Parameter Name Hints

Update to ICSharpCode.Decompiler 6.1.0.5902

Apply limited code cleanup when creating new files

Clean up null handling in UnitTestingRemoteHostClientWrapper

Merge release/dev16.8 to master

Remove the code for RichNav now that //build has happened

Nullable enable analyzer driver

Need to account for the case when `GetNextClientConnectionAsync` is
called before the server fully shuts down. The testable host should just
return a `Task` that doesn't complete until `EndListening` completes
(just as the implementation host does)

closes #46758

Fix assert caught in integration tests - compilation event queue may be null at analyzer driver dispose for early cancellation.

Allow TypeScript access to the RemoteLanguageServiceWorkspace

Remove UI thread filtering of code actions

Co-authored-by: NYair Halberstadt <yairhalberstadt@gmail.com>

This moves the ref assembly resources display in solution explorer to be
hierarchical based on the target framework that they came from. Prior to
this all of the assemblies were just dumped into the root of the project

Merge release/dev16.8 to master

Merge release/dev16.7 to release/dev16.8