Updated for 1709 / 16299 target

[Caopi]

There is a new official alternative to this package, see https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/desktop-to-uwp-enhance and https://www.nuget.org/packages/Microsoft.Windows.SDK.Contracts

But, it's only available from 1803 onwards, so I updated this project to the last version supported before that (1709), which is also the oldest windows 10 sdk version available with the visual studio 2019 installer.