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/decode/Decoder.java

@@ -0,0 +1,85 @@
+/*******************************************************************************
+ *     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.decode;
+
+import io.github.dsheirer.message.IMessageProvider;
+import io.github.dsheirer.message.Message;
+import io.github.dsheirer.module.Module;
+import io.github.dsheirer.sample.Listener;
+
+public abstract class Decoder extends Module
+							  implements IMessageProvider, Listener<Message>
+{
+	/* This has to be a broadcaster in order for references to persist */
+	protected Listener<Message> mMessageListener;
+
+	/**
+	 * Decoder - parent class for all decoders, demodulators and components.  
+	 */
+	public Decoder()
+	{
+	}
+
+	@Override
+	public void dispose()
+	{
+		mMessageListener = null;
+	}
+
+	/**
+	 * Identifies the decoder type (ie protocol) 
+	 */
+	public abstract DecoderType getDecoderType();
+
+
+    /**
+     * Adds a listener for receiving decoded messages from this decoder
+     */
+    @Override
+    public void setMessageListener( Listener<Message> listener )
+    {
+    	mMessageListener = listener;
+	}
+
+    /**
+     * Removes the listener from receiving decoded messages from all attached
+     * decoders
+     */
+    @Override
+    public void removeMessageListener()
+    {
+    	mMessageListener = null;
+    }
+
+    /**
+     * Broadcasts the message to the registered message listener
+     */
+    public void broadcast( Message message )
+    {
+    	if( mMessageListener != null )
+    	{
+    		mMessageListener.receive( message );
+    	}
+    }
+
+	@Override
+	public void receive( Message message )
+	{
+		broadcast( message );
+	}
+}