Instead of duplicating what QElapsedTimer & QDeadlineTimer already do.
Well, technically speaking, we aren't getting ticks, but nanoseconds
now, but the times are only used in comparisons with each other, to
measure the control overhead, so the unit in which they are measured
doesn't matter.
This also makes all OSes use the same type of timers. There's no
exception for per-thread timing.
Change-Id: I115db302eb114bed8cd1fffd14557b228284f2c0
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
b630a4513c