Work to add C style entry points to library that allow most functionality

src/Evaluator/EvalValues/EvalValue.hpp

@@ -31,7 +31,7 @@ public:
     virtual bool EvaluateBool(){
         throw EvaluationException("Can't evaluate this EvalValue as bool.");
     }
-    virtual std::string EvaluateString(){
+    virtual std::string* EvaluateString(){
         throw EvaluationException("Can't evaluate this EvalValue as string.");
     }
 };
@@ -62,12 +62,6 @@ public:
             return false;
         return this->EvaluateBool() == b->EvaluateBool();
     };
-
-    std::string EvaluateString() final{
-        std::ostringstream strs;
-        strs << _value;
-        return strs.str();
-    }
 };
 
 #endif //PORYGONLANG_EVALVALUE_HPP