Start an animation. Animations are started based on their name. Each animation can have an optional identifier (id) which is used to ensure that animations run in an exclusive manner. If an existing animation is running that uses the same identifier, then that animation is stopped before this animation is started. The data argument is as follows:
The animation name to start
An optional instance id to be associated with the animation. Animation identifiers can be used with different animations to ensure that only one animation of the set is running at a time.
When the animation stops it will emit a notification event in the form of
gre.animate.complete.[name]. This event will be delivered within the context of the gra.animate action and will be delivered to the object which invoked the action.