Detect absence of AFD and report only changes.

The current code cannot detect the absence of AFD once it has been
seen in the stream. As AFD can appear in user data after sequence,
group or picture start codes, the idea is to reset the stored AFD
value when processing the sequence start code. In the case where
AFD is seen in user data, it is stored internally, to have it ready
when the first slice is processed. At least at that time, AFD data
has been seen and can be analyzed for changes. At any change, the
AFD value will then be stored into a stream property. Doing this
only for changes avoids locks while writing the same value over and
over to the stream's property.

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