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/fm/FMDemodulatorModule.java

@@ -0,0 +1,115 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014-2016 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.fm;
+
+import io.github.dsheirer.dsp.filter.FilterFactory;
+import io.github.dsheirer.dsp.filter.Window;
+import io.github.dsheirer.dsp.filter.fir.complex.ComplexFIRFilter_CB_CB;
+import io.github.dsheirer.dsp.fm.FMDemodulator_CB;
+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.IUnFilteredRealBufferProvider;
+import io.github.dsheirer.sample.real.RealBuffer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.ScheduledExecutorService;
+
+public class FMDemodulatorModule extends Module implements IComplexBufferListener, IUnFilteredRealBufferProvider
+{
+    private final static Logger mLog = LoggerFactory.getLogger(FMDemodulatorModule.class);
+
+    private static final int SAMPLE_RATE = 48000;
+
+    private ComplexFIRFilter_CB_CB mIQFilter;
+    private FMDemodulator_CB mDemodulator;
+
+    /**
+     * FM Demodulator with I/Q filter.  Demodulated output is unfiltered and
+     * may contain a DC component.
+     *
+     * @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.
+     */
+    public FMDemodulatorModule(int pass, int stop)
+    {
+        assert (stop > pass);
+
+        mIQFilter = new ComplexFIRFilter_CB_CB(FilterFactory.getLowPass(
+            SAMPLE_RATE, pass, stop, 60, Window.WindowType.HAMMING, true), 1.0f);
+
+        mDemodulator = new FMDemodulator_CB(1.0f);
+        mIQFilter.setListener(mDemodulator);
+    }
+
+    public FMDemodulatorModule(float[] filter)
+    {
+        mIQFilter = new ComplexFIRFilter_CB_CB(filter, 1.0f);
+        mDemodulator = new FMDemodulator_CB(1.0f);
+        mIQFilter.setListener(mDemodulator);
+    }
+
+    @Override
+    public Listener<ComplexBuffer> getComplexBufferListener()
+    {
+        return mIQFilter;
+    }
+
+    @Override
+    public void dispose()
+    {
+        mIQFilter.dispose();
+        mIQFilter = null;
+
+        mDemodulator.dispose();
+        mDemodulator = null;
+    }
+
+    @Override
+    public void reset()
+    {
+        mDemodulator.reset();
+    }
+
+    @Override
+    public void setUnFilteredRealBufferListener(Listener<RealBuffer> listener)
+    {
+        mDemodulator.setListener(listener);
+    }
+
+    @Override
+    public void removeUnFilteredRealBufferListener()
+    {
+        mDemodulator.removeListener();
+    }
+
+    @Override
+    public void start(ScheduledExecutorService executor)
+    {
+    }
+
+    @Override
+    public void stop()
+    {
+    }
+}