Move codecs stuff in audio/codecs directory - Must autoreconf all

configure.ac

src/audio/Makefile.am

src/audio/audiofile.h

src/audio/codecDescriptor.cpp

src/audio/codecDescriptor.h

src/audio/codecs/Makefile.am

src/audio/codecs/README

src/audio/codecs/alaw.cpp

src/audio/codecs/audiocodec.h

src/audio/codecs/gsmcodec.cpp

src/audio/codecs/ilbc.cpp

src/audio/codecs/ilbc/FrameClassify.c

src/audio/codecs/ilbc/FrameClassify.h

src/audio/codecs/ilbc/LPCdecode.c

src/audio/codecs/ilbc/LPCdecode.h

src/audio/codecs/ilbc/LPCencode.c

src/audio/codecs/ilbc/LPCencode.h

src/audio/codecs/ilbc/Makefile.am

src/audio/codecs/ilbc/StateConstructW.c

src/audio/codecs/ilbc/StateConstructW.h