Method framerate

include/xstudio/utility/timecode.hpp:35–35

    [[nodiscard]] unsigned int seconds() const { return seconds_; }
    [[nodiscard]] unsigned int frames() const { return frames_; }
    [[nodiscard]] double framerate() const { return frame_rate_; }
    [[nodiscard]] bool dropframe() const { return drop_frame_; }
    [[nodiscard]] unsigned int total_frames() const;