Filter for Scheduler (offline, online, idle, warning)

[Walter.Koller]

We have ~100 resources and it would be very helpful to be able to have filter on the current status of VCI in Schedule. eg to activate the filter to only see resources in status 'warning'. 

This is especially helpful since groups/folder as collapsed by default (which I think is an improvement over previous version). And there is no easy way to disable 'starting private resources when BP UI starts' for all workplaces.

When activating this filter, all resources meeting this filter should be shown. If necessary, groups should be expanded to make resources visible.