fileselector: divided to header,body, and footer. #68
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This PR fixes the bug that @JeanBilheux found: the widget will always be at the end of all widgets when user change dir by clicking "Jump" or "Enter" buttons.
The reason was that the implementation remove the whole widget and create a new one and display it when change directory.
In this PR, we change the implementation so that the widget is divided to header, body and footer.
When changing dir, only the body got replaced. This way the widget will stay in the same place.
Also added "custom_layout" keyword argument so that the layout can be customized.