Google Sign-In iOS 6.0.0

• Google Sign-In for iOS is now open source.
• Swift Package Manager support.
• Support for Simulator on M1 Macs.
• API surface updates
  • GIDSignIn
    • sharedInstance is now a class property.
    • signIn is now signInWithConfiguration:presentingViewController:callback: and always requests basic profile scopes.
    • addScopes:presentingViewController:callback: is the new way to add scopes beyond basic profile to a currently signed-in user.
    • restorePreviousSignIn is now restorePreviousSignInWithCallback:.
    • disconnect is now disconnectWithCallback:.
    • The GIDSignInDelegate protocol has been removed in favor of GIDSignInCallback and GIDDisconnectCallback blocks.
    • All sign-in flow configuration properties have been moved to GIDConfiguration.
  • The GIDConfiguration class had been added to represent the configuration needed to sign in a user.
  • GIDAuthentication
    • getTokensWithHandler: is now doWithFreshTokens:.
    • The GIDAuthenticationHandler typedef has been renamed GIDAuthenticationAction.
    • refreshTokensWithHandler: has been removed, use doWithFreshTokens: instead.
  • GIDSignInButton no longer makes calls to GIDSignIn internally and will need to be wired to an IBAction or similar in order for you to call signInWithConfiguration:presentingViewController:callback: to initiate a sign-in flow.