A slate to write and draw on, then export to html

highlight selection while dragging

Mouse stuff is pretty strenuous. For the first time I have to be careful not to recompute too often. And I ran into a race condition for the first time where resetting line.y within App.draw meant mouse clicks were extremely unlikely to see line.y set.

Created by  Kartik K. Agaram  on June 3, 2022
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