Higher level built-in strings

[Walter Bright]

Sean Kelly wrote:
> I've had the same experience.  The proposed changes would make string useless
> to me, even for Unicode work.  I'd end up using ubyte[] instead.

At this point, the experience with D strings is that D gets it right. To change 
it would require someone who has spent a *lot* of hours programming in utf 
making a very compelling argument.