[phobos] Proposal of StopWatch module

[Brad Roberts]

On Thu, 19 Aug 2010, Andrei Alexandrescu wrote:
> 
> As I'm sure you know we're trying to help the matter with library-based
> approaches, but leaving straight in the language a feature that is impossible
> to make safe is not admissible. Walter and I agree that scope must be
> abolished.

Cast and union can't be made safe either.. should they be removed?  Why 
not push scope out of the safed subset and leave the tool around where 
it's useful?