330 WIP on redesigning the P25 C4FM decoder. Creates a new decoder

based on the P25 LSM decoder using a costas loop and a gardner detector.
Updates the Demodulator Viewer FX application to add in a symbol chart
and a phase error chart.  The decoder won't lock on yet ... still a wip.

src/main/java/io/github/dsheirer/module/decode/fleetsync2/Fleetsync2Decoder.java

@@ -90,7 +90,7 @@ public class Fleetsync2Decoder extends Decoder implements IFilteredRealBufferLis
         mMessageProcessor = new Fleetsync2MessageProcessor( aliasList );
         mMessageFramer.addMessageListener( mMessageProcessor );
         
-        mMessageProcessor.setMessageListener( this );
+        mMessageProcessor.setMessageListener( getMessageListener() );
 	}
     
     public void dispose()