[#3376] Code cleanup

sflphone-common/src/audio/alsa/alsalayer.cpp

sflphone-common/src/audio/audiorecord.cpp

sflphone-common/src/audio/audiorecorder.cpp

sflphone-common/src/audio/dcblocker.cpp

sflphone-common/src/audio/delaydetection.cpp

sflphone-common/src/audio/echocancel.cpp

sflphone-common/src/audio/echocancel.h

sflphone-common/src/audio/jitterbuf.cpp

sflphone-common/src/audio/pulseaudio/audiostream.cpp

sflphone-common/src/audio/pulseaudio/pulselayer.cpp

sflphone-common/src/audio/pulseaudio/pulselayer.h

sflphone-common/src/audio/sound/audiofile.cpp

sflphone-common/src/audio/sound/audiofile.h

sflphone-common/src/audio/speexechocancel.cpp

sflphone-common/src/config/yamlengine.cpp

sflphone-common/src/iax/iaxvoiplink.cpp

sflphone-common/src/managerimpl.cpp

sflphone-common/src/sip/sipaccount.cpp

sflphone-common/src/sip/sipvoiplink.cpp