0.01: New Widget!
0.02: Tweaks for variable size widget system
0.03: Ensure redrawing works with variable size widget system
0.04: tag HRM power requests to allow this ot work alongside other widgets/apps (fix #799)
0.05: Use new 'lock' event, not LCD (so it works on Bangle.js 2)
0.06: Allow configuration of minimum confidence for HRM values
