Improve console clear screen performance#618
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Like Node does.
It has side-effects: https://stackoverflow.com/a/37778152 The new implementation follows Node, that is, it moves the cursor home and then it clears the screen down from there. IN addition, avoid doing any of this if the terminal is dumb.
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See the individual commits.
It might not fully fix #617 but it's a step in the right direction.