Use VehicleInterfaceDescriptor to pass status info to Enabler.
Remove unused function for grabbing info on pipeline sources.
Use standard action bar icons from the Android project.
Protect against an uninitialiezed variable.
Clean up code to set VI status icons.

This works for the most part, but if you:

* Change to the USB source, see the icon
* Change to the network source, but with the IP and port pointing to
        not a running server...
* The icon doesn't change - stays at USB.
* Start a server at that port - network source connects, then the icon
* changes.