#90 [WIP] Adds support for attribute monitors to all of the decoder states. Updates color scheme in 'Now Playing' view for channel states. Wires selection listener for selected channel metadata to the Events and Messages views. Finalizes format for horizontal audio panels, font and coloration.

src/channel/metadata/AttributeMonitor.java

@@ -51,13 +51,15 @@ public class AttributeMonitor<T>
      * different from the current value, has a higher occurrence count than the current value.  If heuristics are
      * disabled, then a change is emitted at each change in the value.
      * @param t
+     *
+     * @return true if the value was changed after processing
      */
-    public void process(T t)
+    public boolean process(T t)
     {
+        boolean changed = false;
+
         if(t != null && !mIllegalValues.contains(t))
         {
-            boolean changed = false;
-
             if(mHeuristicsEnabled)
             {
                 if(mOccurrenceCounts.containsKey(t))
@@ -103,6 +105,8 @@ public class AttributeMonitor<T>
                 mListener.receive(new AttributeChangeRequest(mAttribute, getValue(), getAlias()));
             }
         }
+
+        return changed;
     }
 
     /**