save camera distortion parameters

[soeroesg]

While they were not available in the past, iOS newly also exposes the camera distortion parameters per frame (and depth frame) https://developer.apple.com/documentation/avfoundation/avdepthdata/2881230-cameracalibrationdata https://developer.apple.com/documentation/avfoundation/avcameracalibrationdata/2881129-lensdistortionlookuptable It would be great to save these too.