Fix some compile time warnings.

audio/src/com/dmdirc/addons/audio/AudioPlayer.java

@@ -98,6 +98,7 @@ public final class AudioPlayer implements Runnable {
      */
     public static AudioType getAudioType(final File file) {
         try (AudioInputStream unused = AudioSystem.getAudioInputStream(file)) {
+            unused.reset();
             return AudioType.WAV;
         } catch (UnsupportedAudioFileException | IOException e) {
             return AudioType.INVALID;

ui_swing/src/com/dmdirc/addons/ui_swing/WindowComparator.java

@@ -33,6 +33,7 @@ import java.util.Comparator;
  */
 public class WindowComparator implements Comparator<Window>, Serializable {
 
+    private static final long serialVersionUID = 1L;
     private final FrameContainerComparator comparator;
 
     public WindowComparator() {

ui_swing/src/com/dmdirc/addons/ui_swing/components/TableTableModel.java

@@ -37,6 +37,7 @@ import javax.swing.table.TableModel;
  */
 public class TableTableModel extends AbstractTableModel {
 
+    private static final long serialVersionUID = 1L;
     private final List<String> headers;
     private final Table<Integer, Integer, String> table;
     private final BiFunction<Integer, Integer, Boolean> editableFunction;