#5747: Handle offhold action for recording conference

sflphone-client-gnome/src/conference_obj.c

sflphone-client-gnome/src/conference_obj.h

sflphone-client-gnome/src/contacts/calltree.c

sflphone-client-gnome/src/dbus/dbus.c

sflphone-client-gnome/src/uimanager.c

sflphone-client-gnome/src/widget/imwidget.c

sflphone-common/src/conference.cpp

sflphone-common/src/conference.h

sflphone-common/src/managerimpl.cpp