Implements variable usage, tweaks and fixes for variable assignment

src/Evaluator/Evaluator.hpp

@@ -35,6 +35,8 @@ class Evaluator {
 
     NumericEvalValue* EvaluateIntegerUnary(BoundUnaryExpression* expression);
     BooleanEvalValue *EvaluateBooleanUnary(BoundUnaryExpression *expression);
+
+    EvalValue *GetVariable(BoundVariableExpression *expression);
 public:
     explicit Evaluator(Script* script){
         _scriptData = script;