add dispose clips

forge-gui-desktop/src/main/java/forge/sound/AudioClip.java

@@ -87,6 +87,14 @@ public class AudioClip implements IAudioClip {
         getIdleClip().loop();
     }
 
+    @Override
+    public void dispose() {
+        for (byte[] b : audioClips.values()) {
+            b = null;
+        }
+        audioClips.clear();
+    }
+
     @Override
     public final void stop() {
         for (ClipWrapper clip: clips) {