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/Module.java

@@ -0,0 +1,57 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2015 Dennis Sheirer
+ * 
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ ******************************************************************************/
+
+package module;
+
+public abstract class Module
+{
+	/**
+	 * Defines the basic component level class for all processing, demodulation
+	 * and decoding components that can operate within a processing chain.
+	 * 
+	 * Modules can optionally implement any of the following interfaces:
+	 * 
+	 * IAudioPacketProvider				produces audio packets
+	 * ICallEventProvider				call events
+	 * IChannelEventProvider			channel events (reset, selection, start, etc)
+	 * IComplexBufferListener			consumes complex samples and normally 
+	 * 									produces demodulated real sample buffers
+	 * IFrequencyCorrectionController	provides tuned frequency error corrections
+	 * IMessageProvider					produces messages
+	 * IRealBufferListener				consumes demodulated real sample buffers
+	 * IRealBufferListener				produces demodulated real sample buffers
+	 * ISquelchStateListener			consumes squelch states
+	 * ISquelchStateProvider			provides squelch states
+	 */
+	public Module()
+	{
+	}
+
+	/**
+	 * Dispose of all resources and listeners and prepare for garbage collection
+	 */
+	public abstract void dispose();
+
+	/**
+	 * Initializes or reset all internal states to default - prepare to process 
+	 * again.  This method is usually invoked between stopping a module and 
+	 * starting it again processing a newly tuned channel, like a traffic 
+	 * channel.
+	 */
+	public abstract void init();
+}