pulse: Improve handling of sink inputs/source outputs, mainly to catch moves to another parents
pulse: Improve handling of sink inputs/source outputs, mainly to catch moves to another parents

jrtc27/libmatemixer,dnk/libmatemixer,mate-desktop/libmatemixer,jrtc27/libmatemixer,mate-desktop/libmatemixer,mratajsky/libmatemixer,mratajsky/libmatemixer,dnk/libmatemixer,monsta/libmatemixer,mratajsky/libmatemixer,monsta/libmatemixer