Changes:
* Remove obsolete targets which are unnecessary now that this repo no longer builds git submodules in a separate build process
* Remove the need for static analysis of 'ArtifactInfo' items
* Simplify how the code signing task is configured
* Remove unused repo tasks
* Remove duplicate lists of external dependencies and packages to be produced
* Remove obsolete build definition
* Remove obsolete build script parameters
* Add VisualStudioSetupOutputPath
As a result of removing Razor's VS projects and upgrading all projects to netcoreapp3.0, we no longer need dependency variable for .NET Core 1.x and 2.x and Visual Studio packages.
Changes:
* Remove 'StandardTestTfm'
* Remove variables for .NET Core 1.0, 1.1, 2.0, 2.1, and 2.2
* Remove VSIX variables
* Stop generating 'branding.props' - this hasn't been used in a while and is no longer needed