* minor enhancements for the countdown face
* Changed usage of countdown timer.
- Long button presses have been removed.
- The light button is used to restore the last countdown as well as enter setting mode when pressed again.
- The visual state has been removed from the display.
- The internal states have been renamed to reflect the new logic.
* restore time when countdown finished.
* support for fast forward on long press (untested).
* support for beeps similar to stop watch
* fixed bug wiht display when fast forwarding
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