Adding paper.js dependency. Handling quadratic/cubic intersection wit…

…h bezier clipping, see const a = new kite.Quadratic(

  dot.v2( 16.704545454545453, -21 ),
  dot.v2( 17.644176136363637, -21 ),
  dot.v2( 18.449573863636363, -20.627130681818183 )
);
const b = new kite.Quadratic(
  dot.v2( 16.704545454545453, -21 ),
  dot.v2( 18.47940340909091, -21 ),
  dot.v2( 19.739701704545453, -19.739701704545453 )
);
kite.BoundsIntersection.getIntersectionRanges( a, b );

area-model-multiplication_en.html

@@ -109,6 +109,7 @@
     '../sherpa/lib/himalaya-1.1.0.js',
     '../sherpa/lib/linebreak-1.1.0.js',
     '../sherpa/lib/flatqueue-1.2.1.js',
+    '../sherpa/lib/paper-js-0.12.17.js',
     '../sherpa/lib/he-1.1.1.js',
     '../assert/js/assert.js',
     '../query-string-machine/js/QueryStringMachine.js',