graph drawing tool

after much struggle, a brute-force undo

Incredibly inefficient, but I don't yet know how to efficiently encode undo mutations that can span multiple lines.

There seems to be one bug related to creating new drawings; they're not spawning events and undoing past drawing creation has some weird artifacts. Redo seems to consistently work, though.

Created by  Kartik K. Agaram  on June 2, 2022
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