Fix compilation against failure against JDK 7u65

Interface java.util.Iterator<E> requires void remove(), but it's not
provided

libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/action/ActionList.java

@@ -137,6 +137,12 @@ public class ActionList extends ArrayList<Action> {
                 }
                 return null;
             }
+
+            @Override
+            public void remove()
+            {
+                throw UnsupportedOperationException();
+            }
         };
     }