* #7097: cleanup, removed redundant code in audio backend

daemon/src/audio/audioloop.cpp

daemon/src/audio/audioloop.h

daemon/src/audio/audiorecord.cpp

daemon/src/audio/audiorecord.h

daemon/src/audio/audiortp/AudioZrtpSession.cpp

daemon/src/audio/codecs/audiocodecfactory.cpp

daemon/src/audio/recordable.cpp

daemon/src/audio/samplerateconverter.cpp

daemon/src/audio/samplerateconverter.h

daemon/src/audio/sound/audiofile.cpp

daemon/src/audio/sound/tone.cpp

daemon/src/audio/sound/tone.h

daemon/src/global.h

daemon/src/managerimpl.cpp