function AnimationMixer(root)
{
	TAnimationMixer.call(this, root);

	this.playing = false;
}
The AnimationMixer is a player for animations on a particular object in the scene.

When multiple objects in the scene are animated independently, one AnimationMixer may be used for each object.

The object stores animations in its animations attribute, which is an array an of animation clips.

@class AnimationMixer
@module Animation
@extends {AnimationMixer}
@param {Object3D} root Animation root object