[swift-evolution] [Pitch] Replace the ternary operator with an in-language function

[Anton Zhilin]

infix operator ♠️ : LogicalDisjunctionPrecedenceinfix operator ♥ :
LogicalDisjunctionPrecedence
func ♠️<T>(lhs: Bool, rhs: @autoclosure () throws -> T) rethrows -> T? {
    if lhs { return rhs() } else { return nil }
}func ♥<T>(lhs: T?, rhs: @autoclosure () throws -> T) rethrows -> T {
    return lhs ?? rhs
}
// Equivalent statements:
condition() ? first() : second()
condition() ♠️ first() ♥ second()

By removal of ?:, we could simplify our system of operators and prevent
some ternary-related bugs/unexpected stuff. We could modify reserved
operators to allow ? instead of ♠️ and : instead of ♥.
​
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