IAnimatable The IAnimatable interface describes objects that are animated depending on the passed time.
 DelayedCall A DelayedCall allows you to execute a method after a certain time has passed.
 Juggler The Juggler takes objects that implement IAnimatable (like Tweens) and executes them.
 Transitions The Transitions class contains static methods that define easing functions.
 Tween A Tween animates numeric properties of objects.