Fix for InitSettings to handle Mac cases where we are running in a bundle or in a console app like SDR Garage.
Moved common settings read/write from SDR class to each device plugin.  Allows use of plugins outside of Pebble, but duplicates settings in each device code.  On the other hand allows each device to customize its settings easier
Misc bug fixes from testing with SdrGarage
SdrGarage checkpoint.  Works, sort of

Losing samples, tuning delayed - probably due to threads not yielding
Removed ProducerConsumer worker functions from DeviceInterface, implementation detail that should not be in interface

For old internal device support, SDR class now defines these
Clean install of Mavericks, Xcode 5, QT 5.2

QT was using 10.8 sdk by default, which is missing symbols and failed link in pebble lib. It worked before because we had Xcode 4 installed before Xcode 5.  Fix was to add explicit 10.9 sdk reference in pebble.pri
Also updated rtl2832 plugin with additional build instructions