Pretty-print Aron JSON data in clipboard

Also fix a code style issue.

source/RobotAPI/libraries/armem_gui/instance/InstanceView.cpp

@@ -325,10 +325,11 @@ namespace armarx::armem::gui::instance
                 }
             }
         }
-
-        if (const std::optional<aron::Path> path = getElementPath(item))
+        
+        const std::optional<aron::Path> elementPath = getElementPath(item);
+        if (elementPath)
         {
-            menu.addAction(makeActionCopyDataToClipboard(path.value()));
+            menu.addAction(makeActionCopyDataToClipboard(elementPath.value()));
         }
 
         if (menu.actions().size() > 0)
@@ -431,7 +432,7 @@ namespace armarx::armem::gui::instance
                 nlohmann::json json =
                     aron::converter::AronNlohmannJSONConverter::ConvertToNlohmannJSON(element);
                 QClipboard* clipboard = QApplication::clipboard();
-                clipboard->setText(QString::fromStdString(json.dump()));
+                clipboard->setText(QString::fromStdString(json.dump(2)));
                 QApplication::processEvents();
             }
             catch (const aron::error::AronException& e)