Fixed: #1627 Previously decompiled scripts not cached

Fixed: SWF is not garbage collected on close in some situations
Fixed: AS1/2 script search does not show all results

src/com/jpexs/decompiler/flash/gui/ImagePanel.java

@@ -1185,6 +1185,7 @@ public final class ImagePanel extends JPanel implements MediaDisplay {
         clearImagePanel();
         timelined = null;
         swf = null;
+        lda = null;
 
         fireMediaDisplayStateChanged();
     }