Convert SceneLabel to new Element interface.
Convert ScenePlaceholder to new Element interface.
Convert SceneText to new Element interface.
Convert SceneLine to new Element interface.
Convert SceneImage to new Element interface.
Convert SceneCenteredText to new Element interface.
Convert CompositeSceneElement to new Element interface.
Convert ClippedElement to new Element interface.
Make SceneElement implement Element (preparing to remove SceneElement completely).
Remove isHidden logic from SceneRenderer.
Inline SceneRenderer.draw
Remove SceneElement.draw
Update CompositeSceneElement to use the new Element interface for children.
CompositeSceneElement is completely transitioned to the new Element interface.
SceneRect is completely transitioned to the new Element interface.
SceneOval is completely transitioned to the new Element interface.
SceneLabel is completely transitioned to the new Element interface.
SceneLine is completely transitioned to the new Element interface.
SceneText is completely transitioned to the new Element interface.
SceneText is completely transitioned to the new Element interface.