Remove Client abstraction layer

daemon/src/account.cpp

daemon/src/client/Makefile.am

daemon/src/client/client.cpp

daemon/src/client/client.h

daemon/src/managerimpl.cpp

daemon/src/managerimpl.h

daemon/src/media/audio/alsa/alsalayer.cpp

daemon/src/media/audio/opensl/opensllayer.cpp

daemon/src/media/audio/sound/audiofile.cpp

daemon/src/ring_api.cpp

daemon/src/sip/pres_sub_client.cpp

daemon/src/sip/pres_sub_server.cpp

daemon/src/sip/sipaccount.cpp

daemon/src/sip/sipaccountbase.cpp

daemon/src/sip/sipcall.cpp

daemon/src/sip/sippresence.cpp

daemon/src/sip/sipvoiplink.cpp

daemon/test/accounttest.cpp