Need a way to get the current remaining time on a looping timer.

[rakkur]

The LoopingTimer function should return some information about the current loop and how much longer the current waiting period is before it's next execution.

We may also want to consider storing/returning additional info like how many times it has run since initialized, when it was first initialized, etc?

per @rkoshak, this involves:

1. convert the when data member to a ZDT and store the ZDT in the when property (this.when = time.toZDT(when))
2. in expire save nextRun to this.when before rescheduling the timer
3. in getDuration instead of returning the time until/since the time in the Timer, use the time between now and this.when

Reference: #114