New AS3 Deobfuscation method similar to that for AS1/2

libsrc/ffdec_lib/src/com/jpexs/decompiler/graph/ScopeStack.java

@@ -16,15 +16,17 @@
  */
 package com.jpexs.decompiler.graph;
 
-import java.util.Stack;
-
 /**
  *
  * @author JPEXS
  */
 public class ScopeStack extends TranslateStack {
 
+    public ScopeStack(boolean allowEmpty) {
+        super(allowEmpty ? "scope" : null);
+    }
+
     public ScopeStack() {
-        super("scope");
+        this(true);
     }
 }