message: Remove no longer used overloads of TileMap::isVisibleTile
diff: @@ -49,9 +49,6 @@ public:
  Tile* getVisibleTile() { return getVisibleTile(tileMouseHover(), mCurrentDepth); }
  bool isVisibleTile(const MapCoordinate& position) const;
  - bool isVisibleTile(NAS2D::Point<int> position, int z) const { return isVisibleTile({position, z}); }
  - bool isVisibleTile(NAS2D::Point<int> position) const { return isVisibleTile(position, mCurrentDepth); }
  - bool isVisibleTile(const Tile& t) { return isVisibleTile(t.xyz()); }
  const NAS2D::Rectangle<int>& boundingBox() const { return mMapBoundingBox; }
  