Initial work on iterators, rework of variable handling by including actual string

src/Evaluator/EvalValues/EvalValue.hpp

@@ -37,7 +37,7 @@ namespace Porygon::Evaluation {
             throw EvaluationException("Can't evaluate this EvalValue as bool.");
         }
 
-        virtual const std::u16string *EvaluateString() const {
+        virtual const std::u16string EvaluateString() const {
             throw EvaluationException("Can't evaluate this EvalValue as string.");
         }