Rectangular Select #36
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Adds a rectangular selection tool that toggles whether a given item is selected when the selection tool is dragged over it. After playing around with the selection tool automatically becoming inactive on mouse-up, I decided interacting felt more natural if the lasso stayed active until the user clicks on the lasso again.
This is accomplished using the svg-intersections library and the kld-affine library, and by exposing each edge's true end points as props to test intersection against.