[swift-evolution] [Pitch] Add an all algorithm to Sequence

[Nevin Brackett-Rozinsky]

If indeed “all(equal:)” is rarely needed, then perhaps it is best to leave
it out *and also* leave out the argument label from “all(matching:)”. Then
the signature would be similar to,

func all(_ predicate: (Element)->Bool) -> Bool

and the points-of-use would look like:

nums.all( isEven )
nums.all{ $0 == 9 }
nums.all{ n in n*n < 2 }

Nevin
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