MonoGame 3.8 prerelease packages are up on NuGet

@harry-cpp

I found the issue, I should have taken a gander into App.xaml.cs really early and compared it to an older project instead of a 3.8 that somehow randomly worked and then shapeshifted…

Anyway, I found the issue and hope you can add the fixes to the NuGet packages?

I am still getting used to Git and NuGet [Though I think I have gotten used to NuGet now], I suppose that is my next challenge for today.