message: Use Tile reference in GraphWalker::check
diff: @@ -110,11 +110,11 @@ void GraphWalker::check(NAS2D::Point<int> point, int depth, Direction direction)
  if (!NAS2D::Rectangle<int>::Create({0, 0}, mTileMap->size()).contains(point)) { return; }
  if (depth < 0 || depth > mTileMap->maxDepth()) { return; }
  - Tile* tile = mTileMap->getTile(point, depth);
  + auto& tile = *mTileMap->getTile(point, depth);
  - if (tile->connected() || tile->mine() || !tile->excavated() || !tile->thingIsStructure()) { return; }
  + if (tile.connected() || tile.mine() || !tile.excavated() || !tile.thingIsStructure()) { return; }
  - if (validConnection(mThisTile->structure(), tile->structure(), direction))
  + if (validConnection(mThisTile->structure(), tile.structure(), direction))
  {
  GraphWalker walker(point, depth, mTileMap);
  }
  