* #9572: Replace utilspp singleton implementation

daemon/README

daemon/configure.ac

daemon/libs/Makefile.am

daemon/libs/utilspp/Makefile.am

daemon/libs/utilspp/null_type.hpp

daemon/libs/utilspp/singleton.hpp

daemon/libs/utilspp/singleton/Makefile.am

daemon/libs/utilspp/singleton/creation_using_new.hpp

daemon/libs/utilspp/singleton/creation_using_new.inl

daemon/libs/utilspp/singleton/lifetime_default.hpp

daemon/libs/utilspp/singleton/lifetime_default.inl

daemon/libs/utilspp/singleton/singleton_holder.hpp

daemon/libs/utilspp/singleton/singleton_holder.inl

daemon/libs/utilspp/threading_single.hpp

daemon/libs/utilspp/threading_single.inl

daemon/src/Makefile.am

daemon/src/audio/alsa/alsalayer.cpp

daemon/src/audio/audiolayer.h

daemon/src/audio/pulseaudio/audiostream.cpp

daemon/src/audio/pulseaudio/pulselayer.cpp