Sensor watch sailing face (#205)

Sensor watch sailing face (#205)

* Update sailing_face.c

Modified sailing_face.

Added features, some of which @niclashoyer already suggested in his initial PR:
- stopwatch-like counter after start signal
- lap counter after start signal
- optional additional sounds at every minute, 30s, 10s countdown
- sound options (no sound, start only, signals only, all)
- maximum starting time up to 10min (instead of 9)
- improved timing, display is no longer delayed by sound

* Update sailing_face.h

Modified sailing_face.

Added features, some of which @niclashoyer already suggested in his initial PR:
- stopwatch-like counter after start signal
- lap counter after start signal
- optional additional sounds at every minute, 30s, 10s countdown
- sound options (no sound, start only, signals only, all)
- maximum starting time up to 10min (instead of 9)
- improved timing, display is no longer delayed by sound