Create the tuner task
Merge branch 'metronome' into UI
Add ui_metronome_task, and ui_draw_beat

TODO:
    change to double buffer
fix typo
Merge branch 'UI' of https://github.com/rtenv-plus-stm32f4/final-project into metronome
Merge branch 'tuner' of https://github.com/rtenv-plus-stm32f4/final-project into metronome