DrawingIsland: Add package reference to Win2D to make it possible to generate a MSIX and deploy

[JesseCol]

For DrawingIsland, add package reference to Win2D to make it possible to generate a MSIX and deploy. With this change, the Lottie version now works on Server2019.

I've also added the PackageReferences to the wapproj. I'm not entirely sure this is required, but I've been encouraged to do this in the past, so I'm doing it here for good measure.

I also gave the package a more recognizable name so it's easy to find with "get-appxpackage".