* Cleanup util.secondsFrom*Clock stuff (simpler maths, tail calls, meaningful printf tokens).
* Use util.secondsToClockDuration in ReadTimer instead of reinventing the wheel three different ways.
* Reschedule unexpired timers properly on resume (as best as we can, given the unreliable nature of REALTIME).
* Make clock timers tick on the dot, instead of at the same second as when being set.
* Speaking of clock timers, leave the math to os.date & os.time, don't reinvent the wheel yet again.
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