[Tremor] RFC: Tremor API changes

[xiphmont at xiph.org]

For the record, I second Tim's proposal.  Also, I think we both
consider this provisional on list feedback.

Part of the reason libogg2 wasn't released was that I decided the API
and buffering strategy, though much lower memory for decoding Vorbis,
did not extend well or deliver benefits proportional to its extra
complexity for multiplexed streams.  As such, the libogg2
implementation used in Tremor is a development dead end, though
potentially a dead end with recycleable code.

Monty