Protoscope crashes when you don't pass the right type into segments property

[nefaurk]

The following code will cause Protoscope to crash on the device:

let polygon = new ShapeLayer() polygon.segments = [new Point({x: 0, y: 0})]

It looks like segments expects an array of Segment objects, not Point objects. We should probably throw a Protonope instead of crashing.

[jbrennan]

Fixed by 131718f

[jbrennan]

We might also want to consider just accepting an array of Point objects too.