Add VoIP link management interface

src/Makefile

src/gui/qt/configurationpanelui.cpp

src/gui/qt/configurationpanelui.h

src/gui/qt/phonebookui.cpp

src/gui/qt/phonebookui.h

src/gui/qt/qtGUImainwindow.cpp

src/gui/qt/url_inputui.cpp

src/gui/qt/url_inputui.h

src/gui/qt/voIPLinkmanagement.ui

src/gui/qt/voIPLinkmanagement.ui.h

src/gui/qt/voIPLinkmanagementui.cpp

src/gui/qt/voIPLinkmanagementui.h

src/manager.cpp

src/sipvoiplink.cpp