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Rename _nm_object_handle_properties_changed(), etc, to be about properties in general, rather than just property changes. Interpret func==NULL in NMPropertiesInfo as meaning "use _nm_object_demarshal_generic", and then reorder the fields so that you can just leave that field out in the declarations when it's NULL. Add a way to register properties that exist in D-Bus but aren't tracked by the NMObjects, and use that for NMDevice's D-Bus Ip4Address property, replacing the existing hack. Also add a few other missing properties noticed along the way.
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