Widget Builder Widget tray graphic and Tooltip

Currently the Widget Builder generates a clear icon for the Widget tray for all Widget Builder Widgets.  This should be updated so that a generic default icon (not clear) is displayed in the Widget tray by default, and the Widget developer should be able to supply their own Widget tray icon and Tooltip text for the Widget tray as part of the Widget configuration. 

I agreed. I created a custom icon for one specific custom widget few months ago and it’s still there after each upgrades! 

Yes, this is much needed.