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/reference/P25NetworkCallsign.java

@@ -0,0 +1,48 @@
+package module.decode.p25.reference;
+
+public class P25NetworkCallsign
+{
+	public static final String[] RADIX_50 =  new String[] 
+			{ " ", "A", "B", "C", "D", "E", "F", "G", 
+		      "H", "I", "J", "K", "L", "M", "N", "O", 
+		      "P", "Q", "R", "S", "T", "U", "V", "W", 
+		      "X", "Y", "Z", "$", ".", "?", "0", "1", 
+		      "2", "3", "4", "5", "6", "7", "8", "9" };
+	/**
+	 * Decodes the string callsign from which the WACN and System identifiers
+	 * were derived.
+	 * 
+	 * Based on code by Eric Carlson at:
+	 * http://www.ericcarlson.net/project-25-callsign.html
+	 * 
+	 * @param wacn
+	 * @param systemID
+	 * @return
+	 */
+	public static String getCallsign( int wacn, int systemID )
+	{
+		int n1 = wacn / 16;
+		int n2 = 4096 * ( wacn % 16 ) + systemID;
+
+		StringBuilder sb = new StringBuilder();
+		
+		sb.append( getLetter( (int)( n1 / 1600 ) ) );
+		sb.append( getLetter( (int)( ( n1 / 40 ) % 40 ) ) );
+		sb.append( getLetter( (int)( n1 % 40 ) ) );
+		sb.append( getLetter( (int)( n2 / 1600 ) ) );
+		sb.append( getLetter( (int)( ( n2 / 40 ) % 40 ) ) );
+		sb.append( getLetter( (int)( n2 % 40 ) ) );
+
+		return sb.toString();
+	}
+	
+	private static String getLetter( int value )
+	{
+		if( 0 <= value && value < 40 )
+		{
+			return RADIX_50[ value ];
+		}
+		
+		return " ";
+	}
+}