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/sample/decimator/ComplexDecimator.java

@@ -0,0 +1,58 @@
+package sample.decimator;
+
+import sample.complex.ComplexSampleListener;
+
+
+public class ComplexDecimator implements ComplexSampleListener
+{
+	private ComplexSampleListener mListener;
+	private int mCounter = 0;
+	private int mDecimationRate;
+
+	/**
+	 * Constructs a new Decimator object with the specified decimation rate.
+	 */
+	public ComplexDecimator( int rate )
+	{
+		mDecimationRate = rate;
+	}
+	
+	public void dispose()
+	{
+		mListener = null;
+	}
+
+	/**
+	 * Sets a new decimation rate.  Rate can be changed after this object
+	 * is constructed.
+	 */
+	public synchronized void setDecimationRate( int rate )
+	{
+		mDecimationRate = rate;
+	}
+
+	/**
+	 * Receives samples allowing only 1 of every (rate) sample to go on 
+	 * to the registered listener
+	 */
+	@Override
+    public void receive( float i, float q )
+    {
+		mCounter++;
+		
+		if( mCounter >= mDecimationRate )
+		{
+			mListener.receive( i, q );
+
+			mCounter = 0;
+		}
+    }
+	
+	/**
+	 * Sets the decimated output listener
+	 */
+	public void setListener( ComplexSampleListener listener )
+	{
+		mListener = listener;
+	}
+}