PdfScrollablePageView: move selections and links inside the image

Now that the Image is being rotated and the "paper" rectangle is not,
we need to work in the right coordinate system for rendering of Shapes
on top, and for handling drags to select text.

Change-Id: I6bc1e2fe7997ffc4673720abdcd3b7e4d9bc9012
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>