new dsp peak detection algorithm
add DSP sketch with frequency ascii art
tool to generate gyro data frames from batch sampled DF logs
add generated data from real Y6B flight
allow fft_start() to use ObjectBuffer<float> for lock-free access
allow ObjectBuffer to be resized
control inclusion of FFT based on HAL_WITH_DSP and HAL_GYROFFT_ENABLED. target appropriate ARM cpus
define hanning window and quinn's estimator
start/analyse version of FFT to support threading
allocate memory in a specific region
calculate frequency and noise bandwidth of two noisiest peaks
control inclusion of DSP based on board size
Andy Piper
Peter Barker