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/adapter/FloatArrayToComplexAdapter.java

@@ -0,0 +1,61 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 Dennis Sheirer
+ * 
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ ******************************************************************************/
+package sample.adapter;
+
+import sample.Listener;
+import sample.complex.ComplexSample;
+
+public class FloatArrayToComplexAdapter implements Listener<Float[]>
+{
+	private Listener<ComplexSample> mListener;
+
+	@Override
+    public void receive( Float[] samples )
+    {
+		if( samples != null )
+		{
+			for( int x = 0; x < samples.length; x += 2 )
+			{
+				if( mListener != null &&
+					samples[ x ] != null && 
+					samples[ x + 1 ] != null )
+				{
+					mListener.receive( new ComplexSample( samples[ x ], 
+											  			  samples[ x + 1 ] ) );
+				}
+			}
+			
+			samples = null;
+		}
+    }
+
+	public void setListener( Listener<ComplexSample> listener )
+	{
+		mListener = listener;
+	}
+	
+	public void removeListener( Listener<ComplexSample> listener )
+	{
+		mListener = null;
+	}
+	
+	public void dispose()
+	{
+		mListener = null;
+	}
+}