Game Center Manager 2022 - Update for iOS 14+ Objective-C GameKit

[danoli3]

For the Objective-C / C++ GameCenter game dev users: here's some fresh working code

Update for iOS 14+ Objective-C GameKit

• Fixes crashes associated with old API's on iOS 14 where targeting new builds + Fixes: https://github.com/nihalahmed/GameCenterManager/issues/78
• Updates Game Center GameKit API usage to latest
• Changes Leaderboard setup methods where leaderboards in use
• Removes Ancient Deprecated Functions
• GameCenterManager - Deprecates old API usage for < iOS 12 GKScore etc
• iOS Example Updated
• Xcode Project Upgraded
• Updated Graphics in Example to use Required Apple Game Center Logos / Guidelines as of 2022
• Updates Obj-c NSArchive to latest API's / Fixes crashes

Bug Fixes:

• Fixes authentication view if already authenticated

iOS Tested working on Devices

• iOS 12
• iOS 14
• iOS 15
• iOS 16 BETA

_macOS examples not yet updated / tvOS examples not yet updated / code fixes not yet fully fixed or tested or macOS _

[danoli3]

Summon @nihalahmed @Sam-Spencer

[danoli3]

More updates:

• Updated further with fixes for iOS 13.0 (crashing old api code)
• Feature fixes for NSDefaults saving
• Fixes Serialisation via Conditional class overload of GKLeaderScore* which apple has not provided a serialisation NSCoder method by default which was causing inoperable saved leaderboards for offline scores
• Added NSDefaults Encryption for scores
• Added context for scores passed through