PSPDFKit-labs/PSTModernizer: Makes it easier to support older versions of iOS by fixing things and adding missing methods

PSTModernizer carefully applies patches to UIKit and related Apple frameworks to fix known radars with the least impact. The current set of patches just applies to iOS 9 and nothing is executed on iOS 10, as the bugs have been fixed there.

Source: PSPDFKit-labs/PSTModernizer: Makes it easier to support older versions of iOS by fixing things and adding missing methods