[theora] Ogg index and Skeleton 4.0

[Chris Pearce]

Hi everybody,

I've updated OggIndex to now output Skeleton 4.0 tracks. The differences 
between Skeleton 3.x and Skeleton 4.0 with OggIndex is:

    * The fisbone packet now includes a "Radix" field.
    * The fisbone packet now includes two new compulsory message
      headers; "Role" and "Name".
    * The fishead packet no longer includes "start time" and "end time"
      fields.
    * The index packets for each track now include the "start time" and
      "end time" fields for that track. The duration can now be
      calculated as the greatest end time of all active tracks minus the
      smallest start time of all active tracks. Thanks to Benjamin for
      pointing out the need for this.
    * I've removed the requirement in my spec that a keypoint must index
      the first keyframe in their page only, and reworded my validity
      conditions.

The new spec can be found here:

http://github.com/cpearce/OggIndex/blob/master/Skeleton-4.0-Index-Specification.txt

If anybody thinks anything else should be added to Skeleton 4.0, please 
speak up now!

I'm going to create a new wiki page for Skeleton 4.0 to replace the 
existing Skeleton 3.0 xiph wiki page, and I'll produce a patch for 
ffmpeg2theora to output Skeleton 4.0 in the next few days.

I'll hopefully be landing support for this in Firefox trunk builds in 
the coming weeks.

All the best,
Chris P.
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