memory related refactor

src/world/LevelEvents.hpp

@@ -11,7 +11,7 @@ enum lvl_event_type {
     EVT_CHUNK_HIDDEN,
 };
 
-typedef std::function<void(lvl_event_type, Chunk*)> chunk_event_func;
+using chunk_event_func = std::function<void(lvl_event_type, Chunk*)>;
 
 class LevelEvents {
     std::unordered_map<lvl_event_type, std::vector<chunk_event_func>> chunk_callbacks;