Long-running child processes (such as Okubo-Weiss eddy detection) cannot be cancelled from ArcGIS

[jjr8]

The problem is that the GeoEco.DataManagement.Processes.ChildProcess class does not check for cancellation in its event loop. It should be simple enough to have it check once a second. Once that is done, any MGET tool that creates a child process will be cancellable.