Various improvements and fixes for audio playback

Added interfaces for generalized audio player functionality:
- AudioPlayback: basic playback controls
- BufferedAudioPlayback: controls for prebuffered audio data

SoundPanel:
- Fixed several loop mode issues
- Added option to use combined or separate play/pause controls
- Click on progress slider moves playback position to mouse position

src/org/infinity/datatype/ResourceRef.java

@@ -195,7 +195,8 @@ public void mouseClicked(MouseEvent event) {
     bView = new JButton("View/Edit", Icons.ICON_ZOOM_16.getIcon());
     bView.addActionListener(this);
 
-    soundPanel = new SoundPanel(SoundPanel.Option.TIME_LABEL, SoundPanel.Option.PROGRESS_BAR);
+    soundPanel = new SoundPanel(SoundPanel.Option.COMPACT_CONTROLS, SoundPanel.Option.TIME_LABEL,
+        SoundPanel.Option.PROGRESS_BAR);
     soundPanel.setDisplayFormat(SoundPanel.DisplayFormat.ELAPSED_TOTAL_PRECISE);
     soundPanel.setVisible(ResourceEntry.isSound(types));