multibuf: Split multiple buffers stuff into separate files.
bits: Split bitstream stuff into separate files.
memint: Split memory integer readers and writers into a separate file.
bytes: Rename bstream.{c|h} into bytes.{c|h}.
configure: Cosmetics around list of source files.
print: Support dump of Windows Media Audio V2 and V3 sample description.

I don't know whether Windows Media Audio V1 can be encapsulated in
ISMV/ISMA or not since SSFBasicMuxer fails to mux the stream.
The Codec Specific Info is stored in the 'wfex' box which just includes
WAVEFORMATEX structure.
lib: Support Opus-in-ISOBMFF.