Add recreateControls flag to the OnDataChanged list/tree event.

[ben-clayton]

This allows the adapter to indicate that there was UI changes for existing elements, while keeping selection and scroll position.

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[ben-clayton]

@sunwangme - I'd definitely agree if we had three or more states for this parameter, or more parameters to the function, but I decided a bool here is fine given that Sublime and Atom can both offer parameter info. I also considered adding a 3rd function DataChanged / DataReplaced, but that just seemed even more confusing.