added completely new mpeg audio decoder (integer only, free format support,...

added completely new mpeg audio decoder (integer only, free format support, lsf/mpeg25 support, high/low precision support, simpler code)


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@117 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b