[swift-evolution] Add conversion String -> Bool

[Arsen Gasparyan]

Hello,

It would be great if we had `init?(_ text: String)` for Bool class. Because
sometime when you're processing JSON/XML it can help you a lot.

Examples:

Bool("true") -> true
Bool("false") -> false
Bool("TrUE") -> true
Bool(" true ") -> nil
Bool("1") -> nil
Bool("Y") -> nil
Bool("whatever") -> nil



via https://bugs.swift.org/browse/SR-1282

Thanks.
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