Deprecate avctx.coded_frame

The rationale is that coded_frame was only used to communicate key_frame,
pict_type and quality to the caller, as well as a few other random fields,
in a non predictable, let alone consistent way.

There was agreement that there was no use case for coded_frame, as it is
a full-sized AVFrame container used for just 2-3 int-sized properties,
which shouldn't even belong into the AVCodecContext in the first place.

The appropriate AVPacket flag can be used instead of key_frame, while
quality is exported with the new AVPacketSideData quality factor.
There is no replacement for the other fields as they were unreliable,
mishandled or just not used at all.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavcodec/pthread_frame.c

@@ -215,7 +215,11 @@ FF_ENABLE_DEPRECATION_WARNINGS
     }
 
     if (for_user) {
+#if FF_API_CODED_FRAME
+FF_DISABLE_DEPRECATION_WARNINGS
         dst->coded_frame = src->coded_frame;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
     } else {
         if (dst->codec->update_thread_context)
             err = dst->codec->update_thread_context(dst, src);