IQ recording file playback partial checkin.

NOTE: only the gui components and settings handling have been implemented.  Actual recording playback is not yet implemented.

Partial checkin of initial P25 decoder development.  

NOTE: P25 decoder is not yet functional.

src/source/tuner/Tuner.java

@@ -31,7 +31,8 @@ import controller.ThreadPoolManager;
  * Tuner - provides tuner channel sources, representing a channel frequency
  */
 public abstract class Tuner implements FrequencyChangeBroadcaster,
-									   FrequencyChangeListener
+									   FrequencyChangeListener,
+									   TunerChannelProvider
 {
 	private String mName;