Added handling of template methods

src/uml/class_diagram_model.h

@@ -232,13 +232,18 @@ struct diagram {
         auto it = std::find(classes.begin(), classes.end(), c);
         if (it == classes.end())
             classes.emplace_back(std::move(c));
+        else
+            spdlog::debug("Class {} already in the model", c.name);
     }
 
     void add_enum(enum_ &&e)
     {
+        spdlog::debug("Adding enum: {}", e.name);
         auto it = std::find(enums.begin(), enums.end(), e);
         if (it == enums.end())
             enums.emplace_back(std::move(e));
+        else
+            spdlog::debug("Enum {} already in the model", e.name);
     }
 
     std::string to_alias(const std::vector<std::string> &using_namespaces,