Gets the list of children on this.
The list is exactly the list of strings for which it is not an error to call get_child.
For GSettings objects that are lists, this value can change at any time. Note that there is a race condition here: you may request a child after listing it only for it to have been destroyed in the meantime. For this reason, get_child may return null even for a child that was listed by this function.
For GSettings objects that are not lists, you should probably not be calling 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 strfreev when you are done with it.
a Settings object
a list of the children on this