The project needed an upgrade to netcoreapp2.1 and I deleted
an obsolete workaround by upgrading benchmark.net.

* Use Arcade dotnet install scripts

* Update roslyn-tools build tasks to 1.0.0-beta3.18523.2

* DotNet version check, remove LocateDotNet.

This reverts commit 3e229811.

See #30264

Added DotNet global tool for code formatting.

Tool can be run on a project, solution, or folder containing a
project or solution. Tool pulls formatting configuration from an
.editorconfig if present, otherwise formats with roslyn defaults.

Move Linux build logic to build\scripts\build.sh
Eliminate MicroBuild scripts

* Move ILAsm publishing to ILAsmDeploy project

* BuildBoss: recognize ReferenceOutputAssembly attribute

* Add GlobalPropertiesToRemove

This produces a new free-threaded, well factored API for adding projects
to the VisualStudioWorkspace. The core type is the VisualStudioProject
which is a free-threaded API that you can use to push information over.
CSharpProjectShim, VisualBasicProject and CPSProject each have an
instance of VisualStudioProject that they push things through.

The inheritence model here is now smaller. CSharpProjectShim and
VisualBasicProject inherit from AbstractLegacyProject, but that's it.
CPSProject now inherits nothing, and AbstractProject is here purely
for TypeScript back-compat until they're moved onto the new APIs. The
expectation is F# and TypeScript both move to VisualStudioProject, which
we make public in some form. Then that type will go away.

This is a package we depend on via normal means, and expect it to
be referenced in our NuGet packages as they are today.