Rework evaluation to use shared pointers, fix bugs

src/Evaluator/EvalValues/NumericEvalValue.hpp

@@ -48,8 +48,8 @@ public:
         return strs.str();
     }
 
-    EvalValue* Clone() final{
-        return new IntegerEvalValue(_value);
+    shared_ptr<EvalValue> Clone() final{
+        return make_shared<IntegerEvalValue>(_value);
     }
 };
 
@@ -76,8 +76,8 @@ public:
         return strs.str();
     }
 
-    EvalValue* Clone() final{
-        return new FloatEvalValue(_value);
+    shared_ptr<EvalValue> Clone() final{
+        return make_shared<FloatEvalValue>(_value);
     }
 };