Add blink notification for voice-message

CHANGES

ChangeLog

README

TODO

src/audio/tonegenerator.cpp

src/audio/tonegenerator.h

src/gui/guiframework.h

src/gui/qt/qtGUImainwindow.cpp

src/gui/qt/qtGUImainwindow.h

src/managerimpl.cpp

src/managerimpl.h

src/sipcall.cpp

src/sipvoiplink.cpp

src/sipvoiplink.h

src/skin.cpp