Removed maximum scan size of 750 images
Save json of scan inputs and use it for future stitching (ensures consistent parameters)
Moved looping autofocus to autofocus thing from recentering thing
Rewrote looping autofocus to skip unneeded moves, as if peak is out of range, no need to nicely focus
Autofocus timing is pretty critical. I've introduced the ability
to abort moves, which introduces ~50ms timing jitter. This
commit reverts the tming-critical move in autofocus to the old behaviour.
I've only reverted the move that really matters - this means
that if you start a massive sweep by accident, you can still
abort it when it's moving down to the start of the sweep.
Currently only has fast_autofocus, and there
may be some work to do on timing, but it works :)
Getting timestamps from the camera rather than
time.time() would be ideal, but it would take some thought to tie that up with
the encoder.
I'm using a low-res stream, as it seems impossible to
turn the bitrate control of the MJPEG stream off,
at least within the picamera2 API.
