------------------
- Extend ``yafowil.referencebrowser`` JS by ``register_array_hooks``,
``array_add``, ``array_index`` methods to enable usage in
``yafowil.widget.array``.
[lenadax]
- Use ``get_root`` in ``register_config`` and ``register_entry``.
[rnix]
- Remove usage of ``Nodespaces`` behavior.
[rnix]
- Replace deprecated use of ``Nodify`` by ``MappingNode``.
[rnix]
- Replace deprecated use of ``NodeChildValidate`` by ``MappingConstraints``.
[rnix]
- Replace deprecated use of ``Adopt`` by ``MappingAdopt``.
[rnix]
- Replace deprecated use of ``allow_non_node_childs`` by ``child_constraints``.
[rnix]