60: Character Properties

Forums:

• https://forums.swift.org/t/pitch-character-and-string-properties/11620
• https://forums.swift.org/t/adding-unicode-properties-to-unicodescalar-character/9310

Pull requests:

• https://github.com/apple/swift/pull/15880
• https://github.com/apple/swift-evolution/pull/847

Proposals:

• https://gist.github.com/milseman/c8c50ed0eef0a21181b0d4eeedbad819
• https://github.com/apple/swift-evolution/blob/master/proposals/0211-unicode-scalar-properties.md