[swift-evolution] Remove Failable Initializers

[Антон Жилин]

Without adding more arguments, I agree with what has been said before me.
Failable initializers replace factory methods in other languages, fitting
into Swift error model.
Basically, init() behaves as  `(Args)->Self`  function, and should be able
to express errors as other functions: `(Args)->Self?`, `(Args)
throws->Self`.
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