Complete crosslap API for Vorbisfile

More Vorbisfile seeking cleanup

Bitrate tracking changes (vorbisfile again) to be more accurate
immediately after seek

Go to static window arrays for Vorbis window... better check this one
on Win32 (passing around static array pointers cross-lib... is that a
nono in win32 DLLs?)

svn path=/trunk/vorbis/; revision=4419