Fixed memory leak in script variables

src/Script.cpp

@@ -28,6 +28,9 @@ Script::~Script() {
     delete this -> BoundScript;
     delete this -> _lastValue;
     delete this -> _evaluator;
+    for (auto v : *this -> _scriptVariables){
+        delete v.second;
+    }
     this->_scriptVariables->clear();
     delete this->_scriptVariables;
 }