hysteresis in throttle control

[sjstein]

The current break-point for determining each notch for the analog throttle control allows oscillation.

Adding a bit of hysteresis into this would be a good update. e.g:

if the breakpoint between N0 and N1 is denoted b0:

• a transition from N0 to N1 requires the analog value to be b0+d
• a transition from N1 to N0 requires the analog value to be b0-d

where d is some integer value (tbd)

The above assumes the throttle action has increasing analog values with increasing notch - this may be backwards (so then just reverse sense of above)

Also, maybe the d(elta) value above would be better served if different for each break point

[sjstein]

Currently being tested in branch 2

[sjstein]

Closed via pull request #4