Replace core language HexStrings with library entity

[Nick Treleaven via Digitalmars-d]

On 17/03/2015 01:45, Daniel Murphy wrote:
> "Nick Treleaven"  wrote in message news:me6jo4$ca$1 at digitalmars.com...
>
>> 0b1010 binary literals (even though C++11 supports them)
>> 0xABCD hex literals (but useful for porting C)
>
> You can take them when you pry them from my cold, dead hands.  These are
> 1000x times more useful than octal and deserve to be built in.

Agreed they are more useful, but that does not necessarily mean they 
should be built-in.