Segment coding of mode and reference frame.
Proof of concept test code that encodes mode and reference frame data at the segment level. Decode-able bit stream but some issues not yet resolved. As it this helps a little on a couple of clips but hurts on most as the basis for segmentation is unsound. To build and test, configure with --enable-experimental --enable-segfeatures Change-Id: I22a60774f69273523fb152db8c31f4b10b07c7f4
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