message: Remove useless const qualifier.
diff: namespace NovelRT {
  struct NovelObjectSortComparison {
  public:
  - inline bool const operator()(NovelObject* lhs, NovelObject* rhs) const {
  + inline bool operator()(NovelObject* lhs, NovelObject* rhs) const {
  return lhs->getOrderInLayer() < rhs->getOrderInLayer();
  }
  };
  