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net.openid.AppAuthForExtensions

This reverts commit 037c17b3.

This reverts commit 5b33fa88.

Resolves #77

401 is expected per RFC 6749 Section 5.2 for the invalid_client code.
Extensions to OAuth may use other error codes (presumably still in the 4xx range).

The only change to the defaults is a question about iOS 12 (since we've gotten 4 or so issue requests about it by now).

Fixes several issues that were out of compliance with these warnings.

Collaboration between Steven E Wright and William Denniss (see #62, #245).

ID Token parsing and OpenID RP Certification

– New OIDIDToken object to parse ID Tokens.
– Token exchange now validates the ID Token pursuant to OpenID Connect Core Section 3.1.3.7. (see code comments for details).

* Support recommended Xcode 9.3 warning: CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF

* using weak self for SFAuthenticationSession completionHandler

Follow up of previous class name refactor.
Cleaned up a few other instances of "coordinator".

UICoordinator refactor.