Remove old Cloud Script revisions using Admin API

Old revisions keep stacking up, removing them one by one from Game Manager is pretty cumbersome so need some easier ways to remove them.

To overcome other shortcomings of the CloudScript I've created a system that I can use to build, test and deploy CloudScript locally on my workstation, and I upload the script using the Admin API. In this process it would make sense to be able to call another API method which removes the old revisions.