Add Option do Decrease Animated QR Code Frame-rate

[odudex]

High resolution at a high frame-rate result in high bandwidth and a good UX, unless the signer hardware can't keep up with it. Krux devices can scan even the high resolution QRs, however, due to the high frame-rate, it will skip some frames. The time it takes for Krux to process each frame is higher than the period each frame is exposed on Sparrow. This is not a big deal, since UR has features that deal very well with skipped frames, but other issues can happen: Depending on device, display, ambient lights, etc camera can adjust its exposure time or even "merge frames". Like when we take a picture in dark environments, it's easier to get a blurred picture. I noticed some times I get 2 QR code frames merged by the camera on tests, and I believe an option to reduce the frame-rate to, for example, 1Hz, would be very beneficial to some low cost devices.