IdleTime
double idlePercentage = (double)fModel->IdleTime()
format_nanotime(fModel->IdleTime(), timeBuffer, sizeof(timeBuffer));
fIdleTime += cpu->IdleTime();
inline nanotime_t IdleTime() const;
inline nanotime_t IdleTime() const;
bigtime_t IdleTime();
fLink.Attach<bigtime_t>(fDesktop->EventDispatcher().IdleTime());