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/fsk/FSK2Decoder.java

@@ -26,6 +26,7 @@ import java.util.BitSet;
 import java.util.List;
 
 import sample.Listener;
+import sample.simplex.SimplexSampleListener;
 import buffer.BooleanAveragingBuffer;
 import dsp.fsk.SymbolEvent.Shift;
 
@@ -49,7 +50,7 @@ import dsp.fsk.SymbolEvent.Shift;
  * Implements instrumentable interface, so that slice events can be received
  * externally to analyze decoder performance.
  */
-public class FSK2Decoder implements Instrumentable, Listener<Float>
+public class FSK2Decoder implements Instrumentable, SimplexSampleListener
 {
 	public enum Output{ NORMAL, INVERTED };
 
@@ -93,7 +94,7 @@ public class FSK2Decoder implements Instrumentable, Listener<Float>
 	 * Primary sample input
 	 */
 	@Override
-	public void receive( Float floatSample ) 
+	public void receive( float floatSample ) 
 	{
 		/* Square the sample.  Greater than zero is a 1 (true) and less than 
 		 * zero is a 0 (false) */