message: Use forward declare for Tile and TileMap in MapViewState
diff: #include "../Common.h"
  #include "../Constants.h"
  -#include "../Map/Tile.h"
  -#include "../Map/TileMap.h"
  -
  #include "../PopulationPool.h"
  #include "../Population/Population.h"
  #include <memory>
  +class Tile;
  +class TileMap;
  +
  +
  enum PointerType
  {
  POINTER_NORMAL,
  