Windows 10 build 18947 (rs prerelease)

Windows 10 build 18947 is a private 20H1 build of Windows 10 which was not intended to be released but accidentally flighted to all insiders in all three rings on 2019-07-24.

Breaking the known insider releases routine, Microsoft managed to also release build 18946.rs_xbox_dev as well as the 18947.rs_xbox version before pulling all three releases after publishing this build in all three architectures.