Merge master to features/lspSupport

* Remove RoslynProjectType

* Remove ToolsVersion, namespace from Project tags

* Remove updating of MSBuildAllProjects

* Update BuildBoss

* Delete DeployTooolsetCompiler

Merge release/dev16.1 to master

 Hide dependency on VsInteractiveWindow package from Microsoft.VisualStudio.LanguageServices package (#35262)

* Hide dependency on VsInteractiveWindow package from Microsoft.VisualStudio.LanguageServices package

* FIx reference

* Comment

(cherry picked from commit c421f124)

* Permit stackalloc in nested contexts. (#28969)
Fixes #26759

Update yml files for `release/*` branches

Update PublishData for "release/" branch prefix

* Update dependencies from https://github.com/dotnet/arcade build 20190407.1

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19207.1

* Update dependencies from https://github.com/dotnet/arcade build 20190409.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19209.2

* Update dependencies from https://github.com/dotnet/arcade build 20190410.7

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19210.7

* Update dependencies from https://github.com/dotnet/arcade build 20190411.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19211.2

* Update dependencies from https://github.com/dotnet/arcade build 20190412.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19212.2

* Update dependencies from https://github.com/dotnet/arcade build 20190413.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19213.2

* Update dependencies from https://github.com/dotnet/arcade build 20190414.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19214.2

* Update dependencies from https://github.com/dotnet/arcade build 20190415.12

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19215.12

* Update dependencies from https://github.com/dotnet/arcade build 20190417.1

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19217.1

* Update dependencies from https://github.com/dotnet/arcade build 20190418.1

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19218.1

* Update dependencies from https://github.com/dotnet/arcade build 20190418.4

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19218.4

* Update dependencies from https://github.com/dotnet/arcade build 20190418.7

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19218.7

* Update dependencies from https://github.com/dotnet/arcade build 20190422.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19222.2

* Update dependencies from https://github.com/dotnet/arcade build 20190423.2

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19223.2

* Use Arcade CoreXT package support

* Update dependencies from https://github.com/dotnet/arcade build 20190424.9

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19224.9

* Fix signing

* Update dependencies from https://github.com/dotnet/arcade build 20190425.5

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19225.5

* Update dependencies from https://github.com/dotnet/arcade build 20190426.3

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19226.3

* Update dependencies from https://github.com/dotnet/arcade build 20190429.8

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19229.8

* Update dependencies from https://github.com/dotnet/arcade build 20190430.6

- Microsoft.DotNet.Arcade.Sdk - 1.0.0-beta.19230.6

Merge dev16.1 to master

This change is required in order to enable running on non-desktop TFM tests from VS test explorer window.

Fixes #29956

Also introduce a helper `TypeSymbol.IsVoidType()`

Fix broken links in Language Feature Status

* Additional Nullability checks for deconstruction:
- Check 'this' param for extension deconstruct
- Re-infer the argument types for generic extension deconstruct
- Update the deconstruction method in instance cases
- Update return type with visited arguments
- Update tests

Fixes #35278

Remove unnecessary parameter

Update Async Streams proposal link

* changed the way we report live analysis to task center

previously, we listen to diagnostic service to report progress. problem is that, it only raise event if it found errors on a file. so what we report is actually last file we found errors on rather than file that we are analyzing.

this caused confusion since we report in task center that we are analyzing file "A" when it is actually "analyzed" not "analyzing"

another issue is since it only report file that contains errors. we might not actually show anything in task center if there is no error, or show file "A" for long time if that is only file with errors.

this PR changes the experience closer to what users would expects. and now progress is for solution crawler not specifically on diagnostics.

now we report file that solution crawler is analyzing.

there is still cavet such as solution cralwer can pause between processing a file if VS is busy. but it will still show file "A". or we will not update UI at least 200ms a part and etc.

since it is task center where we don't want to be too impactful to VS, based on feeedback we will see whether we need to do more such as detect solution crawlwer pause and update task center to show pasue. or update task center to show different stage such as analyzing/analyzed.

or show in task center, what analyzer is actually running such as diagnostic, todo, designer attribute scan, find all reference cache and etc.

* addressing PR feedbacks

Update foreach based on nullable analysis

Fixes #34018

Also fixes a corresponding issue in the switch expression
Fixes #34299
See also #35029