FIFO support for zoneminder zone debugging (#2594)

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Adds fifo options for diagnostic images for much lower impact diagnostics mode.  Diagnostic images are only written when there is a client listening for them (otherwise they are skipped).  Also added a json stream for the detection data so you can see in real time the pixels or blobs detected for the motion.  This allows for easy real time stream of both delta and reference images (as video streams) along with the detection numbers.

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