Added support for creating a string outline of a bound script for debugging purposes

src/Evaluator/Evaluator.cpp

@@ -263,6 +263,7 @@ namespace Porygon::Evaluation {
             case BoundExpressionKind::Cast:
                 return this -> EvaluateImplicitCastExpression(expression);
         }
+        throw exception();
     }
 
     EvalValuePointer Evaluator::EvaluateBinary(const BoundBinaryExpression *expression){