P25 LSM decoder work in progress. Adds a CQPSK decoder based on Max's (KA1RBI) scope.py and gardner loop.

The CQPSK decoder is starting to take shape, but needs more tweaking and testing.  It's not keeping a good lock on strong P25 signals.  I have to add some more features to the intrumentation package to allow me to visualize the internals of the CQPSK decoder so that I can get a better sense of what needs fine tuning.

The CQPSK decoder may work for anyone that wants to sync the repo and run the build script.

src/dsp/gain/DirectGainControl.java

@@ -71,6 +71,8 @@ public class DirectGainControl implements GainController, RealSampleListener
 		{
 			mGain = mMaximum;
 		}
+		
+		mLog.debug( "Gain Increase: " + mGain );
 	}
 	
 	@Override
@@ -82,6 +84,7 @@ public class DirectGainControl implements GainController, RealSampleListener
 		{
 			mGain = mMinimum;
 		}
+		mLog.debug( "Gain Decrease: " + mGain );
 	}
 	
     public void setListener( RealSampleListener listener )