Bug: need to check setFrameTrackIndex

[Sunrisepeak]

    void setFrameTrackIndex(int frameTrackIndex) {
        __mFrameTrackVec.back() = frameTrackIndex;
    }

[Sunrisepeak]

when __mFrameTrackVec.size == 0

[Sunrisepeak]

TODO: optimize addAnim

    template <typename T>
    HAnimate & addAnim(const T & anim, int frameTrackIndex = 0) {
        __mAnimVec.push_back(std::make_shared<T>(anim));
        __mFrameTrackVec.push_back(frameTrackIndex);
        return *(__mAnimVec.back()); // TODO: optimize
    }

[Sunrisepeak]

TODO: optimize addAnim

    template <typename T>
    HAnimate & addAnim(const T & anim, int frameTrackIndex = 0) {
        __mAnimVec.push_back(std::make_shared<T>(anim));
        __mFrameTrackVec.push_back(frameTrackIndex);
        return *(__mAnimVec.back()); // TODO: optimize
    }