[timer] an accumulating_timer would be nice

[Thorsten Ottosen-3]

Hi,

For some measurements, it would be nice with a timer with the following
interface

class accumulating_timer
{
public:
    accumulating_timer(); // don't start timing
    void start();
    void stop();
    double elapsed() const;
};

The benefit here would be that we don't have to convert to seconds until
that data is actually needed.

Thoughts?

-Thorsten
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