Update imagepicker iOS to use PHPickerViewController

[sitefinitysteve]

QBImagePickerController is a third-party CocoaPod that only does the album-list → grid experience, it has no search bar.

PHPickerViewController is the better option with search and runs out of process...

[sitefinitysteve]

https://gist.github.com/sitefinitysteve/d9f5642e0fe87b631d8a5b4650b672e6