Commits to .NET Core SDK 2.1.400

This is a curated list of commits from the .NET Core SDK 2.1.400 development cycle.

CLI

[96c9dc3] Fix 'dotnet sln add' for multitargeted C# and VB projects
[dc3835d] Add nunit project and item templates to bundle
[c7cf8a5] Add DOTNET_HOST_PATH for dotnet nuget commands
[9cd006f] Make the interactive switch not implicit for restore command
[b23c372] Fix 'add package' parsing add interactive flag for the add package commands
[04f2856] Updated the expected implicit NETStandard.Library to 2.0.3
[c834c8c] Add interactive flag for the add package command
[2594a6d] Always store absolute full path in directory and file path (#9363)
[0b1509d] Change completion suggestion to standard capitalization
[983612b] Fix relative path tool path (#9330)
[b1f8eb1] Fix crash when user home directory cannot be determined.
[ca8a109] Add retry when Directory.Move (#9313)
[88e2e9e] Improve command line help user experience.
[089d8bf] Remove internal-reportinstallsuccess from dotnet complete
[6f18407] Improve command completion by updating the new and nuget parsers to match their current supported syntax"
[63d3078] Fix header output generated by dotnet sln list
[2a735db] Removing direct dependency to NetStandard.Library From TestFramework
[b7a8c6d] Introducing a Config object as a input to the FirstRunConfigurer
[f9b939f] Fix MSBuild invocation to quote property option values
[270fc44] Do not set BaseIntermediateOutputPath in temp project of dotnet install (#9122)