Support performing actions via the autoscaler dialog. This adds
'autoscaleActions' and 'actionFilter' options to the autoscaler, which
specify and handle the actions appearing in the UI.
Performing these actions will cause a loading overlay to appear until
actions are finished, when the action bar is refreshed via the action
filter.
This change includes the new dialog box for the CloudStack Autoscaler
implementation. It is accessible by a button ('Autoscaler') that
appears under each LB rule.
This also contains changes to the multiEdit widget to support features
required for Autoscaler:
-Fixes context/data passing to custom button widgets
-Fixes data retrieval for select fields
