Method emplace

src/fl/stl/priority_queue.h:96–99

    template<typename... Args>
    void emplace(Args&&... args) {
        _data.emplace_back(fl::forward<Args>(args)...);
        push_heap(_data.begin(), _data.end(), _comp);
    }

    void pop() {
        pop_heap(_data.begin(), _data.end(), _comp);