Adding Xbox as UWP alias and deprecation of WinJS

[moxie-coder]

Xbox one from what I can tell can run UWP apps or winjs apps, like said here in this documentation, since it runs on a (albeit modified) version of Microsoft Windows, I feel like adding Xbox as an alias for UWP/winjs, since it also shows here that uwp is an alias/target, and Xbox one supports appx files which is what a uwp/winjs app is although they’ve seemed to move away from winjs, since the documentations I found so far are for windows 8, so deprecating winjs might not be a bad idea