* recreate review thumbnail directory before writing and log write failures
cleanup's remove_empty_directories() can rmdir an empty clips/review, after which thumbnail writes silently fail. Ensure the directory exists before both cv2.imwrite calls and check their return value
* add docs for add camera wizard
* Handle indefinite events when a segment needs to forcibly be ended for a ceamera
* update keyframe interval article link
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Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>
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