provide method to determine noise at a particular frequency
add ability to record per-peak SnR
correct bad array indexing leading to free memory read
track all three axes for health and peaks
remove slewed frequency values, since slewing is now done in the filters
ReplayGyroFFT initial implementation
allow IMU data to be read and written from a file
only build Replay on SITL
correctly calibrate FFT in Replay
better noise simulation in Replay
FTN3 logging
allow FFT peaks to swap indefinitely as long as they both still exist.
Leads to much smoother frequency transitions
increase the energy gap required to switch the tracked peak
use exit on stop for Replay
filter noise tracking more aggressively for post-filter samples
remove message and use appropriate gyro window
when using post-filter do not fallback to throttle-based estimate
AP_GyroFFT: default SnR to 10 when using post-filter samples
Andy Piper