New audio player class for non-buffered sounds and various improvements

Added new interface for generalized audio player functionality:
- StreamingAudioPlayback: controls for streamed/non-buffered audio data

New class: StreamingAudioPlayer
- provides audio playback functionality for non-buffered audio data

Updated InfinityAmpPlus and MUS resource viewer to use new StreamingAudioPlayer class.
Various sound-related improvements and bugfixes.

src/org/infinity/datatype/ResourceRef.java

@@ -65,8 +65,7 @@ public class ResourceRef extends Datatype
   private static final Comparator<ResourceRefEntry> IGNORE_CASE_EXT_COMPARATOR = new IgnoreCaseExtComparator();
 
   /** List of resource types that are can be used to display associated icons.  */
-  private static final HashSet<String> ICON_EXTENSIONS = new HashSet<>(
-      Arrays.asList(new String[] { "BMP", "ITM", "SPL" }));
+  private static final HashSet<String> ICON_EXTENSIONS = new HashSet<>(Arrays.asList("BMP", "ITM", "SPL"));
 
   /** Special constant that represents absense of resource in the field. */
   private static final ResourceRefEntry NONE = new ResourceRefEntry("None");

src/org/infinity/gui/InfinityAmp.java

@@ -42,6 +42,12 @@
 import org.infinity.util.SimpleListModel;
 import org.infinity.util.io.StreamUtils;
 
+// TODO: remove class from project
+/**
+ * A music player for MUS files.
+ *
+ * @deprecated Superseded by {@link InfinityAmpPlus}.
+ */
 @Deprecated
 public final class InfinityAmp extends ChildFrame
     implements ActionListener, ListSelectionListener, Runnable, Closeable {