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/spectrum/menu/FrameRateItem.java

@@ -0,0 +1,39 @@
+package spectrum.menu;
+
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+import javax.swing.JCheckBoxMenuItem;
+
+import spectrum.DFTProcessor;
+
+public class FrameRateItem extends JCheckBoxMenuItem
+{
+    private static final long serialVersionUID = 1L;
+
+    private DFTProcessor mDFTProcessor;
+    private int mFrameRate;
+    
+    public FrameRateItem( DFTProcessor processor, int frameRate )
+    {
+    	super( String.valueOf( frameRate ) );
+    	
+    	mDFTProcessor = processor;
+    	mFrameRate = frameRate;
+
+    	if( processor.getFrameRate() == mFrameRate )
+    	{
+    		setSelected( true );
+    	}
+    	
+    	addActionListener( new ActionListener() 
+    	{
+			@Override
+            public void actionPerformed( ActionEvent arg0 )
+            {
+				mDFTProcessor.setFrameRate( mFrameRate );
+            }
+		} );
+    }
+}
+