support both tree view mode and form view mode

it's easy to use tree fields, you just need to define two attributes as below in tree view or form view

there'a demo view file you can find it in the view folder and the file is named view.xml, don't forget to define parent fields in the model before you can use it. any problem, just email to me, i will reply you asap. 88150875@qq.com or skype jacky@blueaden.com