Detect reference shapes that determine color of other shapes

[alejandrodemiquel]

In some cases, the color of a Shape in the input determines the color of other shapes in the output. We should be able to detect these reference shapes, detect which actions they imply, and act accordingly.

[alejandrodemiquel]

I detected some cases in which the only difference between the input and the output are changes in the color of shapes:

t.sameIOShapes and t.onlyShapeColorChanges

They are: 39, 141, 179, 353, 414, (444), 450, 471, 484, 536, 596, 687, 730, 753, 774, 792, 798.

But I'm sure that there are many other similar ones that could benefit as well.