Fixed GFX: DefineExternalImage/2, DefineSubImage disallow not working replace button in favor of raw editing

libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/gfx/DefineExternalImage.java

@@ -198,4 +198,9 @@ public class DefineExternalImage extends ImageTag {
             }
         }
     }
+    
+    @Override
+    public boolean importSupported() {
+        return false;
+    }
 }

libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/gfx/DefineExternalImage2.java

@@ -210,4 +210,9 @@ public class DefineExternalImage2 extends ImageTag {
             }
         }
     }
+    
+    @Override
+    public boolean importSupported() {
+        return false;
+    }
 }

libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/tags/gfx/DefineSubImage.java

@@ -124,11 +124,14 @@ public class DefineSubImage extends ImageTag {
 
     @Override
     public void setImage(byte[] data) throws IOException {
-        serImage = new SerializableImage(ImageHelper.read(data));
-        clearCache();
-        setModified(true);
+        
     }
 
+    @Override
+    public boolean importSupported() {
+        return false;
+    }
+        
     @Override
     public ImageFormat getImageFormat() {
         return ImageFormat.PNG;