39 - WIP - incorporates the latest P25 C4FM decoder from master and

updates the LSM decoder to follow the same design pattern.  Adds LSM
decoder support to the demodulator viewer application.  The current
symbol timing gain for LSM is set too high -- is using the C4FM gain
and causes too much fluctuation in the timing error.

src/main/java/io/github/dsheirer/source/IControllableFileSource.java

@@ -40,7 +40,7 @@ public interface IControllableFileSource
 
     public long getFrameCount() throws IOException;
 
-    public int getSampleRate();
+    public double getSampleRate();
 
     public void setListener(IFrameLocationListener listener);