Alongside the new iPad’s introduction, Autodesk announced its newest app, SketchBook Pro. The company started by noting that it’s reached tens of millions of iOS users in just two years, compared to the 29 years it took to reach that number on the desktop. SketchBook Pro focuses on line art, and takes advantage of the iPad’s new A5X processor. The app is capable of exporting images greater than 100 megapixels. It’ll be available…