Enhancement - Add support for iOS 14, or lowest easy target

[michael94ellis]

Lower the target of the app in project settings

resolve all warnings, probably copy/paste from stack overflow

find lowest convenient iOS version, probably 14, but this story is totally optional! Give it a shot, it might not be worth completing but will be a good learning opportunity for supporting version differences

[Mike117687]

merge-these-into-unstoppable-wallet-iOS