Child of Issue #64 - Flash countdown time & preferably all visible aspects of timer, when intervals finish

[nbacon0]

The desired behavior of YAPA v2: when the end of whatever designated number of intervals is reached, the timer itself that is displayed on the desktop, flashes 00:00 (preferably all visual elements flash, such as "Intervals Complete, Start & Stop, and indicator that displays number of intervals) to indicate the desired number of intervals have been completed

Desired Behavior Work Interval --> Break Interval --> x10 --> Number of Intervals (as designated in Settings) is reached --> Interval Time Display flashes 00:00