InitSettings will return a SettingsProvider.

NewChecklist initializes and returns a new Checklist.

NewController returns a new base controller.

TimerFinished represents a finished timer.

TimerPaused represents a paused timer.

TimerRunning represents a running timer.

TimerStopped represents a stopped timer.

Checklist provides the implementation of a checklist.

Controller is the base struct for any controller.

Settings provides just some general settings.

SettingsProvider provides something idk.

TimerState is an alias of int to represent timer state.