[swift-evolution] Add a `clamp` function to Algorithm.swift

[Nicholas Maccharoli]

Swift Evolution,

Having a`clamp` function available in the standard library would complement
`min` and `max` really well.

I mentioned this before when the discussion for Swift 4 was still in stage
1, but now that stage 2 has started I thought it might be worth while to
bring up again.

Still needs some work, but here is the draft proposal I wrote previously

https://github.com/Nirma/swift-evolution/commit/a51c543a76e9a1021996fb4b617311a588e7f397

Basically it boils down to something like this.

public func clamp<T : Comparable>(value: T, _ lower: T, _ upper: T) -> T {
  return max(lower, min(value, upper))
}



What does the community think?

- Nick
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