`setup.rbxcdn.com/version*` is deprecated; need channel

[sewnie]

Hi, i would like to report that the fetch endpoints version and versionQTStudio on setup.rbxcdn.com with subsequent mirrors, are all deprecated and are no longer being updated.

The new replacement is the clientsettings API.

There is no information regarding the 'channel' of the builds which are fetched using this library, meaning it is not possible to fetch most GUIDs, they need the channel marker.