Channel Spectral Display

- Adds Channel Spectrum tab to display FFT of the audio output of the currently selected channel
 - Upgrades to JTransforms 3.0 FFT library
 - Adds three new context menus to main and channel spectral displays:
   -- Baseline - affects the vertical rendering baseline of the FFT
   -- Amplification - affects the vertical height of each FFT bin
   -- Averaging - affects how many FFTs are averaged to produce the display

src/controller/channel/ChannelEvent.java

@@ -0,0 +1,52 @@
+package controller.channel;
+
+public class ChannelEvent
+{
+	private Channel mChannel;
+	private Event mEvent;
+
+	/**
+	 * ChannelEvent - event describing any changes to channels
+	 * @param channel - channel that changed
+	 * @param event - change event
+	 */
+	public ChannelEvent( Channel channel, Event event )
+	{
+		mChannel = channel;
+		mEvent = event;
+	}
+	
+	public Channel getChannel()
+	{
+		return mChannel;
+	}
+	
+	public Event getEvent()
+	{
+		return mEvent;
+	}
+	
+	/**
+	 * Channel Events - used to specify channel events and changes to channel
+	 * configurations and settings.
+	 */
+	public enum Event
+	{
+		CHANGE_ALIAS_LIST,
+		CHANGE_DECODER,
+		CHANGE_ENABLED,
+        CHANGE_EVENT_LOGGER,
+		CHANGE_NAME,
+		CHANGE_SITE,
+		CHANGE_RECORDER,
+		CHANGE_SELECTED,
+		CHANGE_SOURCE,
+		CHANGE_SYSTEM,
+
+		CHANNEL_ADDED,
+        CHANNEL_DELETED,
+
+		PROCESSING_STARTED,
+		PROCESSING_STOPPED,
+	}
+}