Implement the _Tick code for a/t/r

[dgets]

This is what I had been working with last in this project. Unfortunately, I didn't write my progress down in the issues here at all. So this is an effort to keep such from happening again.

At this point it looks like the _Tick code does successfully determine whether or not there is an activated Alarm. If so, it begins updating the display on a per-second basis. I'm not certain yet whether or not the display, and/or countdown values ,are being updated correctly at those intervals, though. This just in, it most certainly does not update correctly, or with legitimate values. Looks like this is the place to start working, and then head off towards implementation of the _Tick for Timers and Reminders.

[dgets]

Having a problem with the checked alarm (and, of course, probably the t/r as well, though not fully implemented yet) becoming unchecked when re-added to the display.

[dgets]

Alarms are now counting down properly, and ringing when they're set to go off. At the point when they ring, however, the countdown keeps going. This causes multiple notifications of the ring, and the display countdown goes into the negative.

[dgets]

Alarm is also ringing prematurely; didn't see exactly when this happened, but I suspect it's at minute whole number intervals. It then begins ringing again, and doesn't stop, at the proper time, as noted above. Now it's not counting down further, though...

[dgets]

...and of course now the countdowns aren't working (or aren't being displayed) at all.