linenoise
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Added runtime history access.
Added linenoiseHistoryLine function to get a copy of a line from the history, and added code to the example to demonstrate it.
I was not fond of the way history access was added by #80 and #81, and also did not like the idea of "baking in" the ! access to history (since I have projects that use !). I think the code I wrote is consistent with "the linenoise way."