public void set_data_full (string key, void* data, DestroyNotify? destroy)
g_object_set_data except it adds notification for when the association is destroyed, either by setting it to a different
value or when the object is destroyed.
Note that the
destroy callback is not called if
data is null.
Object containing the associations
name of the key
data to associate with that key
function to call when the association is destroyed