feat: option to disable mouse support (#3372)

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same thing

This adds an option to disable mouse support, so that the terminal
handles mouse events, making it easy to select text. I've found myself
needing to copy from history frequently recently and holding Shift is
not convenient.

However, this makes mouse scrolling not work as expected, e.g. in my
case it scrolls six lines at a time.

Also see #1209.

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