umbraco8 - How can I get an UmbracoHelper in an HttpHandler?

In Umbraco 7 you could use UmbracoContext.EnsureContext() and some trickery to get an UmbracoHelper outside of an Umbraco context, such as in an HttpHandler. In Umbraco 8 UmbracoContext.EnsureContext() has been removed so how can we do this now?Specifically I want to get the root node, in my HttpHandler like var helper = CreateUmbracoHelper();var root = helper.ContentAtRoot().First();But I can't figure out how I might implement CreateUmbracoHelper()....Read more