Fork of lines.love without drawings; useful starting point for further forks

new command: capture

Ideally exiting the capture window would also remove its column, so that we don't need two operations. But I don't yet know how to cleanly accomodate that special case. Good enough for now that the flow before capture is clean; we'll put up with some klunkiness exiting capture mode.

Created by  Kartik K. Agaram  on July 29, 2022
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