Replace core language HexStrings with library entity

[Kagamin via Digitalmars-d]

On Wednesday, 18 March 2015 at 08:45:53 UTC, Daniel Murphy wrote:
> I have no idea what your point is.  Lexer complexity matters 
> for every tool that needs to lex D code.

Language complexity matters for tools. Lexer complexity is only 
download and build, it doesn't matter what is the lexer, 
complexity is roughly the same, only compilation of bigger lexer 
can take longer if it has more lines.