* Use new WinRT APIs for SpecialFolders
* Update tests
* Update test package
Fix test verification
* Clean up project files
* Add back test skip condition
* Add comments and fallback Windows dir.
Move the RID calculation to the common dir.props file.
Compute a ToolRuntimeRID to be used for assets that need to run as part of the tools infrastructure to build things.
Compute PackageRID which will be used as the target RID for the assets that are being built.
Make sure both ToolRuntimeRID and PackageRID honor both a specific and a portable RID.
when it was set to netstandard it would binplace to the netstandad ref folder
which caused errors in our apicompat checks. Windows.winmd is not support in
a netstandard way so having specific targets is better anyway.