Adds additionall configuration options from debugging
When using 640x480 @ 120 FPS and the processing can't keep up with the frame rate, some glitches start showing in the images; these commit adds some additional options that were used during test and might be useful in the future. I'm not entirely sure where these glitches come from, but it seems they originate within libuvc. After tracing it back to this point, increasing LIBUVC_NUM_TRANSFER_BUFS seems to get rid of the bug. However, setting it too high impedes opening all three pupil cameras. Temporary solution is to make sure processing can keep up with the framerate (e.g., by downsizing the processing input in EyeRecToo).
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