Working on device_interfaces, moved to C++11
Device plugins: Successful test of new ProcessIQData callback with SDRFile

Switching from calling ProcessBlock directly in each SDR, which requires tight coupling with Receiver to an indirect callback (ProcessIQData) which is created using new C++11 bind().  This will get passed to the plugin without the plugin having any reference to Receiver.  Next will be to switch all current SDR devices to use callback.
Completed move from ProcessBlock to ProcessIQData bind() callback

Removed old code from Receiver and collapsed to single ProcessIQData method