* ProgressProvider now has an abort() call
* Abort button support added to the progress dialog
* YggdrasilTask and MojangAccount adapted to support abort
YggdrasilTask will time out after 10 seconds of no network activity, or when the user pushes the Play Offline button.
In offline mode, all instance update tasks are skipped! This will need further work.
It now opens and coloses as expected, depending on user
preferences and the status of the various processes involved.
Console window geometry and state are remembered between runs.
