Memory/CPU performance improvement and Audio/Mixer source restructuring

Converted to use float primitives and to keep samples in buffer format until the sample rate is decimated to 48kHz.  
Added new non-recursive, CIC decimation filter -- untested

Updated sound card/mixer input source management.  Now testing for mono/stereo support for each card and limiting channel choices accordingly.  Separated the mixersource into a ComplexMixer and and SimplexMixerSource.  The ComplexMixer is used for sound card based tuners like the funcube.  The SimplexMixerSource is used for demodulated sound card inputs.

Interfaces for sample handling - standardized on using 'Complex' to indicate I/Q samples and 'Simplex' to indicate demodulated float samples.  The processing chain now accepts either a decimated (48k) list of complex samples from a tuner channel source, or a 48k simplex buffer (array of demodulated float samples).

Resolved issue with HackRF tuner not applying tuner configuration information.

src/dsp/nbfm/NBFMDemodulator.java

@@ -17,16 +17,17 @@
  ******************************************************************************/
 package dsp.nbfm;
 
-import sample.Broadcaster;
 import sample.Listener;
 import sample.complex.ComplexSample;
+import sample.simplex.SimplexSampleBroadcaster;
+import sample.simplex.SimplexSampleListener;
 import dsp.filter.ComplexFIRFilter;
 import dsp.filter.FilterFactory;
 import dsp.filter.Window.WindowType;
 
 public class NBFMDemodulator implements Listener<ComplexSample>
 {
-	private Broadcaster<Float> mBroadcaster = new Broadcaster<Float>();
+	private SimplexSampleBroadcaster mBroadcaster = new SimplexSampleBroadcaster();
 	private ComplexFIRFilter mIQFilter;
 	private FMDiscriminator mDiscriminator;
 
@@ -77,7 +78,7 @@ public class NBFMDemodulator implements Listener<ComplexSample>
 	/**
 	 * Adds a listener to receive demodulated samples
 	 */
-	public void addListener( Listener<Float> listener )
+	public void addListener( SimplexSampleListener listener )
     {
 		mBroadcaster.addListener( listener );
     }
@@ -85,7 +86,7 @@ public class NBFMDemodulator implements Listener<ComplexSample>
 	/**
 	 * Removes a listener from receiving demodulated samples
 	 */
-    public void removeListener( Listener<Float> listener )
+    public void removeListener( SimplexSampleListener listener )
     {
 		mBroadcaster.removeListener( listener );
     }