[swift-evolution] Remove (!) logical negation operator

[Chris Lattner]

> On Dec 15, 2015, at 12:13 PM, Rudolf Adamkovic via swift-evolution <swift-evolution at swift.org> wrote:
> 
> +1 for clean-up:
> 
> • "and" instead of && 
> • "or" instead of ||
> • "not" instead of !
> • if expressions instead of ?!
> 
> Easier to read, easier to type, easier to understand for beginners.

FWIW, this is not a likely direction for Swift, and has been discussed before:
https://lists.swift.org/pipermail/swift-evolution/2015-December/000032.html

-Chris