IOS 15 fixes and improvements

Updated with support for older generation iPhones with 4" and 4.7" screen sizes.

Complete SwiftUI redesign
Calculations can be made quicker with new wheel slider system
Haptic Feedback provides for an improved user interaction with the app
Handicap Index range increased in line with latest R&A/USGA World Handicap System, and extended fan any additional Course Handicap

Updated for IOS  13