codec/schroedinger: Use new autoparse+tagging api

Schroedinger now has an api that allows passing in arbitarily aligned
data units (ie, whole encapsuation units), use this rather than attempt
to chunk up the bitstream ourselves.

This new api also enables buffer tagging, where buffers may be tagged
with arbitary data that gets associated with the next picture to
commence at or after the start of the buffer.  This removes the need
for the TLBs and associated accounting.
Signed-off-by: David Flynn <davidf@rd.bbc.co.uk>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>