fix event

src/layer/layer.hpp

@@ -18,12 +18,9 @@ namespace VE
 
     public:
       virtual void on_attach() {};
-      virtual void on_detach() {};
       virtual void render() {};
       virtual void on_event(event e) {};
 
-      void set_event_fn(const event_fn<event>& fn) { execute = fn; };
-
     protected:
       event_fn<event> execute;
   };