Merge branches 'master' and 'release' into release

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/m4/.gitignore

daemon/m4/ax_lib_expat.m4

daemon/m4/ax_path_lib_pcre.m4

daemon/m4/ax_pthread.m4

daemon/src/Makefile.am

daemon/src/account.cpp

daemon/src/account.h

daemon/src/array_size.h

daemon/src/audio/Makefile.am

daemon/src/audio/alsa/alsalayer.cpp

daemon/src/audio/alsa/alsalayer.h

daemon/src/audio/audiolayer.cpp

daemon/src/audio/audiolayer.h

daemon/src/audio/audioloop.cpp

daemon/src/audio/audioloop.h