* Use Arcade's convention for setting IsPackable (must be explicitly set)
* Use Arcade conventions for using DebugType and eng/Versions.props
* Remove dead code
* Update restore feeds in daily builds.md
* Disable UsingToolNetFrameworkReferenceAssemblies in analyzer tests
* Remove usage of TestGroupName (an obsolete KoreBuild setting)
* Use IVT as a .csproj attribute
\n\nCommit migrated from f12d709976
* Remove obsolete targets, properties, and scripts
* Replace IsProductComponent with IsShipping
* Undo bad merge to version.props
* Update documentation, and put workarounds into a common file
* Replace usages of RepositoryRoot with RepoRoot
* Remove API baselines
* Remove unnecessary restore feeds and split workarounds into two files
* Enable PR checks on all branches, and disable autocancel\n\nCommit migrated from f41cfded3c
.NET Core 2.0 reached EOL last year. This removes multi-targeting our test projects and test assets to only use .NET Core 2.1 and .NET Framework 4.6.1.\n\nCommit migrated from 084494d21d