- feat: separate timer actions from states by adding a new class TimerEvent to hold actions Reset, Start, Pause, Finish, Refesh that could be performed on a timer.
- feat: handle multiple countdown timers in the App file by creating a map of the timer id to the countdown timer.
- fix: use gson instance from TypeAdapter in Room's Converters class
- ref: remove scroll view parent from each timer item, a fix for the keyboard obscuring a label will be implemented in a future commit
