Optimize parameter passing to avoid unnecessary copying

src/graphics/ui/GUI.hpp

@@ -108,16 +108,16 @@ namespace gui {
         /// (does not add node to the main container)
         /// @param name node key
         /// @param node target node
-        void store(std::string name, std::shared_ptr<UINode> node);
+        void store(const std::string& name, std::shared_ptr<UINode> node);
 
         /// @brief Get node from the GUI nodes dictionary 
         /// @param name node key
         /// @return stored node or nullptr
-        std::shared_ptr<UINode> get(std::string name) noexcept;
+        std::shared_ptr<UINode> get(const std::string& name) noexcept;
 
         /// @brief Remove node from the GUI nodes dictionary
         /// @param name node key 
-        void remove(std::string name) noexcept;
+        void remove(const std::string& name) noexcept;
 
         /// @brief Set node as focused 
         /// @param node new focused node or nullptr to remove focus
@@ -129,7 +129,7 @@ namespace gui {
 
         void onAssetsLoad(Assets* assets);
 
-        void postRunnable(runnable callback);
+        void postRunnable(const runnable& callback);
 
         void setDoubleClickDelay(float delay);
         float getDoubleClickDelay() const;