The following events are generated by optional Storyboard plugins.
Timer events are generated as a result of a timer action. See documentation
on the gra.timer action for further information about configuring timers.
The timer event name will be formatted as timer.[name] where name is the
value set as the name of the timer when the action was defined.
Animation events are generated as a result of an animation action. See documentation
on the gra.animation action for further information about configuring animations.
When an animation is completed, an animation event will be fired. The event name will
be formatted as gre.animate.complete.[name] where name is the
value set as the name of the animation when the action was defined.