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dav1d: add event flags to the decoding process

James Almer requested to merge jamrial/dav1d:event_flags into master

And a function to fetch them. Should be useful to signal changes in the bitstream the user may want to know about.

Starting with two flags, DAV1D_EVENT_FLAG_NEW_SEQUENCE and DAV1D_EVENT_FLAG_NEW_OP_PARAMS_INFO, which signal the presence of an updated sequence header in the last returned (or to be returned) picture.

This is an alternative to !1183 (closed), as described there, implementing event flags that cover the decoding process in general, instead of picture specific flags.

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