Itai Ferber 5eb58ef8d4 Improve experience of derivation of Codable types ...

* Introduce diagnostics that explain why derivation of
  Encodable/Decodable fail rather than just silently failing
* Allow properties with default values to be omitted from CodingKeys
  enum and from encoding/decoding
* If `CodingKeys` is a typealias, reach through it more consistently to
  get at the final target type
* Add unit tests to confirm this new behavior for classes and structs

NOTE: Although this made the diff bigger, standalone variables named
"type" have been renamed to "target" throughout, since the word "type"
may be ambiguous and makes debugging impossible. "target" is unique.

2017-05-19 09:45:54 -07:00

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