A Dart timer that can be paused, resumed and reset.
PausableTimer aims to be as similar and compatible as possible with Dart's
Timer, while providing extra funcionality.
PausableTimer should work exactly the same as a regular Timer, but can be
paused, resumed and restarted with the respective methods (.pause, .start
and .resume).
There are also additional getters to check if the timer is active, paused, expired or cancelled.
More detailed examples can be found in the example folder.