message: Remove no longer used TileMap::tileHighlight() method
diff: @@ -49,7 +49,6 @@ public:
  void mapViewLocation(NAS2D::Point<int> point);
  void centerMapOnTile(Tile*);
  - const NAS2D::Point<int>& tileHighlight() const { return mMapHighlight; }
  bool tileHighlightVisible() const;
  int tileMouseHoverX() const { return mMapHighlight.x() + mMapViewLocation.x(); }
  