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/FMDiscriminator.java

@@ -19,10 +19,11 @@ package dsp.nbfm;
 
 import sample.Listener;
 import sample.complex.ComplexSample;
+import sample.simplex.SimplexSampleListener;
 
 public class FMDiscriminator implements Listener<ComplexSample>
 {
-	private Listener<Float> mListener;
+	private SimplexSampleListener mListener;
 	private ComplexSample mPreviousSample = new ComplexSample( 0.0f, 0.0f );
 	private double mGain;
 	
@@ -93,7 +94,7 @@ public class FMDiscriminator implements Listener<ComplexSample>
 		mPreviousSample = currentSample;
     }
 
-    public void setListener( Listener<Float> listener )
+    public void setListener( SimplexSampleListener listener )
     {
 		mListener = listener;
     }