listChildren
Gets the list of children on @settings.
The list is exactly the list of strings for which it is not an error to call g_settings_get_child().
There is little reason to call this function from "normal" code, since you should already know what children are in your schema. This function may still be useful there for introspection reasons, however.
You should free the return value with g_strfreev() when you are done with it.
Return
a list of the children on @settings, in no defined order