#1723 Initial commit - audio call management feature.

-Implements Spring Boot and spring dependency injection - significant code refactoring.
-Creates database repository with Calls table
-Implements AudioManager to update database and manage audio recordings.
-Calls paging and searching
-Adds audio recording to wave file and places file in the calls database table.
-Audio spectrum view with 64 bins.
-Updates audio playback manager to process the incoming calls queue and support auto, auto-locked, replay, and mute playback modes.
-Adds channel lock/unlock and mute/unmute features.
-Adds column configuration editor to change column order & visibility and adds table state monitoring to save any user customization of the column ordering.
-Adds call table column sort ordering to the saved table state and restores the sort on application launch.
-Adds audio playback channel view options for: Complete, Standard and Minimal.  Updates user preferences Audio | Playback section to allow user to select preferred view style.

src/main/java/io/github/dsheirer/channel/metadata/ChannelMetadata.java

@@ -1,6 +1,6 @@
 /*
  * *****************************************************************************
- * Copyright (C) 2014-2022 Dennis Sheirer
+ * Copyright (C) 2014-2023 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
@@ -35,11 +35,10 @@ import io.github.dsheirer.identifier.configuration.SystemConfigurationIdentifier
 import io.github.dsheirer.identifier.decoder.ChannelStateIdentifier;
 import io.github.dsheirer.identifier.decoder.DecoderLogicalChannelNameIdentifier;
 import io.github.dsheirer.sample.Listener;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.util.Collections;
 import java.util.List;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Channel metadata containing details about the channel configuration, decoder state and current
@@ -66,17 +65,27 @@ public class ChannelMetadata implements Listener<IdentifierUpdateNotification>,
     private AliasModel mAliasModel;
     private AliasList mAliasList;
 
+    /**
+     * Constructs an instance
+     * @param aliasModel for alias lookup
+     * @param timeslot for this metadata
+     */
     public ChannelMetadata(AliasModel aliasModel, Integer timeslot)
     {
         mAliasModel = aliasModel;
         mTimeslot = timeslot;
     }
 
+    /**
+     * Constructs an instance with timeslot (default = 0)
+     * @param aliasModel for alias lookup
+     */
     public ChannelMetadata(AliasModel aliasModel)
     {
-        this(aliasModel, null);
+        mAliasModel = aliasModel;
     }
 
+
     public Integer getTimeslot()
     {
         return mTimeslot;