Initial commit of redesigned internal processing and audio management.

Note: Several of the decoders are currently non-functioning in this
commit.  If you want the latest functioning codebase, please checkout
the commit prior to this one.  All decoders will eventually be updated
with this new architecture.

Currently broken:
- Logging and recording
- Aux decoders (Fleetsync/MDC/LoJack/Tait)
- LTR/Passport decoders

Changes in this commit:
- Module architecture for decoders and components with central
provisioning by the DecoderFactory
- Transition from Complex sample stream processing to float buffer
processing for improved memory management
- Redesigned filter structures - to support buffers and streams
- Resolved several memory leak issues
- Universal sharing of the thread pool manager
- Added centralized audio management with call/user prioritization and
new gui with mute/volume controls
- Embedded audio metadata for eventual streaming support
- Redesigned ProcessingChain to support independent re-use
- Added new TrafficChannelManager to handle traffic channel allocations
- Traffic Channel pool size and Call timeout available in P25 and
MPT1327 configs
- Redesigned channel and decoder gui components

src/module/decode/p25/C4FMSlicer.java

@@ -0,0 +1,70 @@
+package module.decode.p25;
+
+import dsp.symbol.Dibit;
+import sample.Broadcaster;
+import sample.Listener;
+import sample.real.RealSampleListener;
+
+/**
+ * C4FM slicer to convert the output stream of the C4FMSymbolFilter into a 
+ * stream of C4FM symbols.  
+ * 
+ * Supports registering listener(s) to receive normal and/or inverted symbol
+ * output streams.
+ */
+public class C4FMSlicer implements RealSampleListener
+{
+	private static final float THRESHOLD = 2.0f;
+
+	private Broadcaster<Dibit> mBroadcaster = new Broadcaster<Dibit>();
+	
+	/**
+	 * Primary method for receiving output from the C4FMSymbolFilter.  Slices
+	 * (converts) the filtered sample value into a C4FMSymbol decision. 
+	 */
+	@Override
+    public void receive( float sample )
+    {
+		if( sample > THRESHOLD )
+		{
+			dispatch( Dibit.D01_PLUS_3 );
+		}
+		else if( sample > 0 )
+		{
+			dispatch( Dibit.D00_PLUS_1 );
+		}
+		else if( sample > -THRESHOLD )
+		{
+			dispatch( Dibit.D10_MINUS_1 );
+		}
+		else
+		{
+			dispatch( Dibit.D11_MINUS_3 );
+		}
+    }
+
+	/**
+	 * Dispatches the symbol decision to any registered listeners
+	 */
+	private void dispatch( Dibit symbol )
+	{
+		mBroadcaster.receive( symbol );
+	}
+
+	/**
+	 * Registers the listener to receive the normal (non-inverted) C4FM symbol
+	 * stream.
+	 */
+    public void addListener( Listener<Dibit> listener )
+    {
+		mBroadcaster.addListener( listener );
+    }
+
+	/**
+	 * Removes the listener
+	 */
+    public void removeListener( Listener<Dibit> listener )
+    {
+    	mBroadcaster.removeListener( listener );
+    }
+}