Optimize parameter passing to avoid unnecessary copying

src/logic/ChunksController.hpp

@@ -21,7 +21,7 @@ private:
 
     /// @brief Process one chunk: load it or calculate lights for it
     bool loadVisible();
-    bool buildLights(std::shared_ptr<Chunk> chunk);
+    bool buildLights(const std::shared_ptr<Chunk>& chunk);
     void createChunk(int x, int y);
 public:
     ChunksController(Level* level, uint padding);