Do not use VisibilityAndGrouping in ViewerPanel
Do not use VisibilityAndGrouping in ViewerPanel

Instead, modify the state() directly.
ViewerPanel still provides a working VisibilityAndGrouping for backwards
compatibility.

Several methods have been deprecated, e.g.
ViewerPanel.getState() and ViewerPanel.getVisibilityAndGrouping().

bigdataviewer/bigdataviewer-core,bogovicj/bigdataviewer-core,bigdataviewer/bigdataviewer-core,bogovicj/bigdataviewer-core