Replace core language HexStrings with library entity

[Daniel Murphy via Digitalmars-d]

"Andrei Alexandrescu"  wrote in message 
news:me870h$1fnc$1 at digitalmars.com...

> On a higher level: there's no subset of the language that's at the same 
> time sufficiently complex and sufficiently obscure to make its removal a 
> net positive.

Associative arrays come close, but only because of their insanely high 
complexity.  Complex numbers are another one, although they can be safely 
ignored most of the time.