Add HttpRuntime.AppDomainAppVirtualPath

[twsouthwick]

No description provided.

[CZEMacLeod]

Does this lead to being able to create a version of System.Web.VirtualPathUtility that works under ASP.Net Core?
I think I only really need

public interface IVirtualPathUtility
{
	string ToAbsolute(string virtualPath);
	string ToAppRelative(string virtualPath);
}
public class VirtualPathUtility : IVirtualPathUtility
{
	public string ToAbsolute(string virtualPath) => System.Web.VirtualPathUtility.ToAbsolute(virtualPath);
	public string ToAppRelative(string virtualPath) => System.Web.VirtualPathUtility.ToAppRelative(virtualPath);
}

[twsouthwick]

@CZEMacLeod this is probably part of it. Can you open an issue with the APIs you would need? The whole VirtualPath infrastructure ends up pulling in a bit of stuff, so we're initially just going after APIs that are used in the wild.