P25 and Airspy work in progress

Updated p25 decoder state to better track calls and call detects from
a trunked channel

Fixed issue with false detects on LDU2 encrypted call messages

Fixed Airspy channel allocation ... will allocate channels across the
entire bandwidth, minus 50 kHz on either end, and will not adjust the
center frequency if it's not needed.

Fixed traffic channel teardown -- traffic channels are immediately 
removed now, without a fade delay.

AudioMetadata - updated flag is now reset upon copying the metadata

src/audio/AudioModule.java

@@ -124,9 +124,6 @@ public class AudioModule extends Module implements IAudioPacketProvider,
 			
 			AudioPacket packet = new AudioPacket( audio, mAudioMetadata.copyOf() );
 
-			/* Reset the updated flag on the metadata */
-			mAudioMetadata.setUpdated( false );
-			
 			mAudioPacketListener.receive( packet );
 		}
 	}