renamed fetch types to be pascal case

include/matador/object/constraint.hpp

@@ -36,7 +36,6 @@ private:
 
   std::string name_;
   std::variant<class attribute*, std::string> attr_;
-  // class attribute* attr_{nullptr};
   object *owner_{nullptr};
   utils::constraints options_{utils::constraints::None};
   std::string ref_table_name_{};

include/matador/object/object.hpp

@@ -2,9 +2,7 @@
 #define MATADOR_OBJECT_HPP
 
 #include "matador/object/attribute.hpp"
-// #include "matador/object/attribute_generator.hpp"
 #include "matador/object/constraint.hpp"
-// #include "matador/object/constraints_generator.hpp"
 
 #include "matador/utils/identifier.hpp"