[swift-evolution] [Draft proposal] Faster/lower-level external String initialization

[Zachary Waldowski]

In response to some recommendations from the Swift 3 plans, the proposed API has been made more comprehensive, and the proposal updated to fit.

The proposal is now PR'ed:

    https://github.com/apple/swift-evolution/pull/101

The code is still where it was before:

    https://github.com/apple/swift/compare/master...zwaldowski:string-from-code-units

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