Updates sample generator and test tuner controller to support multiple

complex buffer listeners.  Removes complex buffer broadcast support from
the source manager and renames it to channel source manager to convey
that it's only responsible for providing channels from the tuner.

src/main/java/io/github/dsheirer/spectrum/SpectralDisplayPanel.java

@@ -435,7 +435,7 @@ public class SpectralDisplayPanel extends JPanel implements Listener<ComplexBuff
             mTuner.getTunerController().addListener(this);
 
             //Register the dft processor to receive samples from the tuner
-            mTuner.getSourceManager().addComplexBufferListener(mDFTProcessor);
+            mTuner.getTunerController().addComplexBufferListener(mDFTProcessor);
 
             mSpectrumPanel.setSampleSize(mTuner.getSampleSize());