Rework of variable scope to reduce load on evaluator

src/Binder/BoundExpressions/BoundExpression.hpp

@@ -134,13 +134,11 @@ public:
 };
 
 class BoundVariableExpression : public BoundExpression{
-    int _scope;
-    int _id;
+    BoundVariableKey* _key;
 public:
-    BoundVariableExpression(int scope, int id, shared_ptr<ScriptType> type, unsigned int start, unsigned int length)
+    BoundVariableExpression(BoundVariableKey* key, shared_ptr<ScriptType> type, unsigned int start, unsigned int length)
             : BoundExpression(start, length, std::move(type)){
-        _scope = scope;
-        _id = id;
+        _key = key;
     }
 
     ~BoundVariableExpression() override = default;
@@ -149,12 +147,8 @@ public:
         return BoundExpressionKind ::Variable;
     }
 
-    int GetScope(){
-        return _scope;
-    }
-
-    int GetId(){
-        return _id;
+    BoundVariableKey* GetKey(){
+        return _key;
     }
 };