Add ring for incoming call

rings/konga.ul

src/Makefile

src/audiobuffer.cpp

src/audiortp.cpp

src/configurationpanel.ui

src/configurationpanel.ui.h

src/configurationpanelui.cpp

src/configurationpanelui.h

src/global.h

src/manager.cpp

src/phonebookui.cpp

src/phonebookui.h

src/qtGUImainwindow.cpp

src/qtGUImainwindow.h

src/skin.cpp

src/skin.h

src/tonegenerator.cpp

src/tonegenerator.h

src/url_inputui.cpp

src/url_inputui.h