WIP - Puck.js reading CSC (cycling speed cadence) BLE sensor to replace bike computer head unit with Puck.js or (later) Pixl.js

Thanks - I just checked on this and it's a bug in Pixl.menu in the Pixl.js firmware (it's slightly special as it is implemented in JS, but the act of executing it seems to mess with the execution state).

I'll try and get a fix in for it, but in the mean time, add this code up the top of what you upload and it'll fix it:

Pixl._menu = Pixl.menu;
Pixl.menu = function(m) { Pixl._menu(m); };