Implemented new countdown progress bar design,
used in Relaxation, Meditation and Power Nap
apps. New implementation shows progress
bar as decrementing as the time passes instead
of incrementing.
Cleanups.
*DigitsContainer definicions moved to cpp file(for proper linkage)
*DigitsContainer changed container to std::vector
*Fixed a bug in ProgressTimerWithBarGraphAndCounter where timerText was
treated as timeWidget
*MeditationCountdownWindow timer is now custom size
*Minus removed form MeditationRunningWindow timer
