xaf--使用非持久化类(non-persistent)来展示lookuplist和展示树结构

* https://supportcenter.devexpress.com/ticket/details/t713009/use-non-persistent-objects-as-lookup-list-for-a-property-in-a-persistent-object
* 使用非持久化类来展示lookuplist
* https://supportcenter.devexpress.com/ticket/details/t612478/recursive-tree-on-non-persistent-bo
* 使用非持久化类来展示树结构