[TIMOB-27392] iOS 13: Support PencilKit

PencilKit makes it easy to incorporate hand-drawn content into your iOS or macOS apps quickly and easily. PencilKit provides a drawing environment for your iOS app that takes input from Apple Pencil, or the user's finger, and turns it into high quality images you display in either iOS or macOS. The environment comes with tools for creating, erasing, and selecting lines. You capture content in your iOS app using a PKCanvasView object. The canvas object is a view that you integrate into your existing view hierarchy. It supports the low-latency capture of touches originating from Apple Pencil or your finger. It then vends the final results as a PKDrawingReference object, whose contents you can save with your app’s content. You can also convert the drawn content into an image, which you can display in your iOS or macOS app. This would be really useful for creative and productivity focussed apps being made in Titanium.