ATTRIB(Keyframe, currentChild, entity, NULL)
ATTRIB(Keyframe, firstChild, entity, NULL)
ATTRIB(Keyframe, lastChild, entity, NULL)
-ENDCLASS(Animation)
+ENDCLASS(Keyframe)
entity makeHostedKeyframe(entity, void(entity, float), float, float, float);
entity makeKeyframe(entity, void(entity, float), float, float, float);
float getNewChildStart(entity);