Enhance Viewer Draw node by adding a “visibility layer" setting

Created by: DolphinDream

Here’s an idea.. I often time want to show/hide multiple viewer draw nodes outputs at the same time and was wondering if adding a visibility layer option to the node would be beneficial for that purpose. You could have certain VD nodes set to display only on certain layers, but not others and use blender’s visibility layer feature to simultaneously turn on/off certain VD outputs.

I think this would a be similar to objects behavior (e.g objects have layer visibility).