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Handles nested data like:
And creates either a tree view or empty-row-separated groups list view
Tree View
![image](https://user-images.githubusercontent.com/328330/57556487-9b547880-7390-11e9-85fa-72b635d58df2.png)
Empty-Row-Separated Groups List View
![ListView](https://user-images.githubusercontent.com/328330/57556998-fb97ea00-7391-11e9-9813-6e7e3a1e1959.png)