v0.1.2.1-test prerelease

v0.1.2.1 — prerelease

The app is now called OpenCFLink (was OpenCfMoto). Android treats it as a
completely new app, so:

1. Uninstall the old OpenCfMoto
2. Install this one
3. Scan the bike's QR code once

Your saved bike, button mappings and settings won't carry over. Sorry — that's
unavoidable when an app changes name.

New

• 800NK support. The picture now fits that dash exactly instead of being
  stretched or having the sides chopped off. Touch, pinch and zoom work.
• Customise your handlebar buttons. Settings → Customize buttons. Pick what
  each press and double-tap does: knob, back, home, select, voice, or navigate
  to a saved address. Reset to defaults whenever you want.
• Picture quality setting. Turn the picture down to give your music room —
  see below.
• New app icon.

Fixed

• The app never switched itself off. It was supposed to give up about 2
  minutes after you turn the bike off. It never did — it just kept running and
  draining your battery until you noticed. Now it actually stops.
• Music stuttering when you ride. The dash talks over Wi-Fi and your helmet
  over Bluetooth, and they share the same airwaves. A moving map crowds out the
  music, so the faster you went the worse it got — fine parked, rough at 60,
  unusable at 100. It now sends far less data, and you can turn the picture down
  in Settings if you still hear it.
• Music pausing on its own after you'd already pressed Stop.
• Volume buttons doing nothing on the 800NK.
• A stray "back" press on the dash every time the bike disconnected.