private static extern void toggl_on_timer_state( IntPtr context, TogglDisplayTimerState cb);
private static extern void toggl_on_timer_state( IntPtr context, TogglDisplayTimerState cb);
private static extern void toggl_on_timer_state( IntPtr context, TogglDisplayTimerState cb);
private static extern void toggl_on_timer_state( IntPtr context, TogglDisplayTimerState cb);