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App icon: new laptop piano metaphor

See merge request !2

Port to the new cpal 0.10 API

See merge request !1

- Separate settings data into a MenuModel struct
- Add initial fade out control

- Fix glitches and clicks
- Amplitude over time can now be based on arbitrary functions
- Remove sound settings from menu (to be reimplemented)

- Replace std::sync::mpsc with crossbeam_channel
- Sync metronome BPM with UI
- Small refactoring

- Move menu code into separate file
- Use new GTK builders

- Set platform version to 3.32
- Add `--share=ipc` to finish arguments