Add support for wavpack format (open source loseless audio)

Here's how ffmpeg "sees" a .wv file

#!

ffmpeg version 1.1.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Feb  5 2013 21:59:54 with gcc 4.7.2 (GCC)
  configuration: --enable-static --disable-shared --disable-ffplay --disable-ffs
erver --enable-memalign-hack --enable-libmp3lame --enable-libass --enable-librtm
p --enable-fontconfig --enable-libfreetype --enable-zlib --extra-libs='-lrtmp -l
polarssl -lws2_32 -lwinmm -lexpat -lfreetype -lfribidi -lz' --arch=x86 --enable-
runtime-cpudetect --enable-pthreads --target-os=mingw32 --cross-prefix=i686-w64-
mingw32- --pkg-config=pkg-config
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 86.100 / 54. 86.100
  libavformat    54. 59.106 / 54. 59.106
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 32.100 /  3. 32.100
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
[wv @ 02DA5AE0] max_analyze_duration 5000000 reached at 5000000
Input #0, wv, from 'e:\M├║sica\The Square\(1987) Truth\01 - Grand Prix.wv':
  Metadata:
    Title           : Grand Prix
    Track           : 1
    Album           : Truth
    Artist          : The Square
    Genre           : Instrumental Rock
    Year            : 1987
    ALBUMARTIST     : The Square
  Duration: 00:02:42.65, start: 0.000000, bitrate: 965 kb/s
    Stream #0:0: Audio: wavpack, 44100 Hz, stereo, s16
    Stream #0:1: Video: mjpeg, yuvj420p, 1024x1024 [SAR 72:72 DAR 1:1], 90k tbr,
 90k tbn, 90k tbc
    Metadata:
      Cover Art (Front): Cover Art (Front).jpg

Official website: http://www.wavpack.com/ Wikipedia link: http://en.wikipedia.org/wiki/WavPack

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