Changes:
- identify different types of duplicate packets
- handle each error differently
- individualised responses to duplicate packets, and to the packet after that
- boost on yaw
- FF smoothly attenuated while sticks are near centre
- no boost immediately after prolonged flat spots
(warning: this means no boost if ADC is on)
- careful empirical checking that the responses are optimal
- updated code annotations for clarity
1. Excludes yaw from ff_boost.
2. Removes suppression for 3x greater up-steps in FF to reduce boost glitching around zero sticks
3. Spike detection gets cleaner passband and tighter rejection above threshold; higher threshold is now possible with better suppression of large spikes.
The feed forward boost concept improves stick response by adding a stick acceleration factor to feed forward. Generating spikes when there are steps in the RC signal is the main problem.
This PR makes one small change to how the spike suppression method is determined.
It no longer uses the 'jerk' signal to generate the spike suppression 'clip' value. Instead it just uses the magnitude of the boost signal itself.
We originally used jerk because it is more sensitive to spikes. Detailed testing shows that jerk is that it has an unwanted impact one full RC step after the spike.
If we use the boost (acceleration) signal as the attenuator, that delayed impact does not occur, making the boost component more precise.
The threshold value for suppression needs to be a bit higher to achieve equivalence.
I've re-named the function to reflect it being related to spike suppression and removed 'jerk' since we aren't using that any more.
