message: Mark TileMap size field as const
diff: @@ -115,7 +115,7 @@ private:
  private:
  int mEdgeLength = 0;
  - NAS2D::Vector<int> mSizeInTiles;
  + const NAS2D::Vector<int> mSizeInTiles;
  int mMaxDepth = 0; /**< Maximum digging depth. */
  int mCurrentDepth = 0; /**< Current depth level to view. */
  