[v3] List of possible breaking changes

[lestrrat]

• NO, there's no plan to do a v3 ATM. However, this acts as our memo.
• Please do not discuss or request new features in this issue -- create a new one instead

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• Introduce context.Context as a parameter in top-level functions such as jwt.Parse
• Change the signature of various Get(string) (interface{}, bool) methods to Get(string, interface{}) error
• Change how code is generated to using a saner tool, so new developers have an easier time fixing problems
• Remove the use of iterators from the library
• Factor out []byte handling (internal/base64)
• Add a way to register more algorithms under jwa

[lestrrat]

things around the iterators (jwk.HeaderPair/HeaderVisitor/HeaderVisitorFunc) need a good hard rethink