Animation System

Classes
class	sp::scene::Animation
class	sp::scene::AnimationJoint
class	sp::scene::AnimationJointGroup
class	sp::scene::AnimationPlayback
class	sp::scene::AnimationSkeleton
class	sp::scene::KeyframeSequence
class	sp::scene::MorphTargetAnimation
class	sp::scene::NodeAnimation
class	sp::scene::SkeletalAnimation