Modernization

• Added doubleLines property, so you can have double height lines for long texts
• Added Dynamic Type support
• Added iOS 13 style rounded edges (iOS 11 and above)
• Adjusted animation length to better match iOS 13 share sheet
• Background color is now secondary system background color (iOS 13 and above)
• Added gesture recognizer to be able to dismiss the picker when tapping outside it
• Modernized the example