* Add and ship file that lists the SDK versions XI supports.
Add and ship a file that lists the SDK versions of the various SDKs XI supports.
Also list the minimum SDK version for each extension.
And add a script that verifies that the current SDK version is in this file,
which should ensure every SDK version bump ends up in the file.
* [mtouch] Remove generated file from source control.
* [SdkVersions] Remove versions not in master yet.
* [SdkVersions] Improve detection script to verify that versions are between min and max, and that both min and max are in the list.
* Move things around a bit and add macOS support.
* Update Versions-mac.plist.in with extension info
Rolf Bjarne Kvinge