Updates pull request from Roman Tsypuk to convert the build system from

ant to gradle.  Removes linux and windows application launch scripts and
produces an executable jar with all resources included.

src/main/java/io/github/dsheirer/module/demodulate/am/AMDemodulatorModule.java

@@ -0,0 +1,124 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014,2015 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 io.github.dsheirer.module.demodulate.am;
+
+import io.github.dsheirer.module.Module;
+import io.github.dsheirer.sample.Listener;
+import io.github.dsheirer.sample.complex.ComplexBuffer;
+import io.github.dsheirer.sample.complex.IComplexBufferListener;
+import io.github.dsheirer.sample.real.IFilteredRealBufferProvider;
+import io.github.dsheirer.sample.real.RealBuffer;
+import io.github.dsheirer.dsp.am.AMDemodulator_CB;
+import io.github.dsheirer.dsp.filter.FilterFactory;
+import io.github.dsheirer.dsp.filter.Window.WindowType;
+import io.github.dsheirer.dsp.filter.fir.complex.ComplexFIRFilter_CB_CB;
+import io.github.dsheirer.dsp.filter.fir.real.RealFIRFilter_RB_RB;
+import io.github.dsheirer.dsp.gain.AutomaticGainControl_RB;
+
+import java.util.concurrent.ScheduledExecutorService;
+
+public class AMDemodulatorModule extends Module
+					implements IComplexBufferListener, IFilteredRealBufferProvider
+{
+	private static final int SAMPLE_RATE = 48000;
+	
+	private ComplexFIRFilter_CB_CB mIQFilter;
+	private AMDemodulator_CB mDemodulator;
+	private RealFIRFilter_RB_RB mLowPassFilter;	
+    private AutomaticGainControl_RB mAGC;
+
+	/**
+	 * FM Demodulator with integrated DC removal and automatic frequency
+	 * correction control.
+	 * 
+	 * @param pass - pass frequency for IQ filtering prior to demodulation.  This
+	 * frequency should be half of the signal bandwidth since the filter will
+	 * be applied against each of the inphase and quadrature signals and the 
+	 * combined pass bandwidth will be twice this value.
+	 * 
+	 * @param stop - stop frequency for IQ filtering prior to demodulation.
+	 * 
+	 * @param maxFrequencyCorrection - defines the maximum frequency +/- that 
+	 * the correction controller can adjust from the center tuned frequency.
+	 * Set this value to 0 for no frequency correction control.
+	 */
+	public AMDemodulatorModule()
+	{
+		mIQFilter = new ComplexFIRFilter_CB_CB( FilterFactory.getLowPass( 
+			SAMPLE_RATE, 5000, 73, WindowType.HAMMING ), 1.0f );
+		
+		mDemodulator = new AMDemodulator_CB( 500.0f );
+		mIQFilter.setListener( mDemodulator );
+
+		mLowPassFilter = new RealFIRFilter_RB_RB( 
+    		FilterFactory.getLowPass( 48000, 3000, 31, WindowType.COSINE ), 1.0f );
+		mDemodulator.setListener( mLowPassFilter );
+		
+		mAGC = new AutomaticGainControl_RB();
+		mLowPassFilter.setListener( mAGC );
+	}
+
+	@Override
+	public Listener<ComplexBuffer> getComplexBufferListener()
+	{
+		return mIQFilter;
+	}
+
+	@Override
+	public void dispose()
+	{
+		mIQFilter.dispose();
+		mIQFilter = null;
+		
+		mDemodulator.dispose();
+		mDemodulator = null;
+		
+		mLowPassFilter.dispose();
+		mLowPassFilter = null;
+		
+		mAGC.dispose();
+		mAGC = null;
+	}
+
+	@Override
+	public void reset()
+	{
+	}
+
+	@Override
+	public void setFilteredRealBufferListener( Listener<RealBuffer> listener )
+	{
+		mAGC.setListener( listener );
+	}
+
+	@Override
+	public void removeFilteredRealBufferListener()
+	{
+		mAGC.removeListener();
+	}
+
+	@Override
+	public void start( ScheduledExecutorService executor )
+	{
+	}
+
+	@Override
+	public void stop()
+	{
+	}
+}