GESTrackObject: Listen to property change from gnlobject
GESTrackObject: Listen to property change from gnlobject

TODO: add/emit the 'changed' signal

volodymyrrudyi/gst-editing-services,MathieuDuponchelle/PitiviGes,freesteph/gst-editing-services,MathieuDuponchelle/PitiviGes,volodymyrrudyi/gst-editing-services,luisbg/gst-editing-services,ahmedammar/platform_external_gst_editing_services,MathieuDuponchelle/PitiviGes,pitivi/gst-editing-services,pitivi/gst-editing-services,luisbg/gst-editing-services,volodymyrrudyi/gst-editing-services,ahmedammar/platform_external_gst_editing_services,pitivi/gst-editing-services,cfoch/gst-editing-services,cfoch/ges,cfoch/gst-editing-services,freesteph/gst-editing-services,pitivi/gst-editing-services,cfoch/gst-editing-services,cfoch/ges,cfoch/gst-editing-services,freesteph/gst-editing-services,cfoch/ges,MathieuDuponchelle/PitiviGes,cfoch/ges