Revert "Begun work on JSON format. Added faceColours."

This reverts commit 379cb36b587417218674c92e80365825c161eb8f.
Now with more inheritance!

Camera is now SceneCamera and inherits from SceneNode.
Object specific code is in in SceneObject and also inherits
from SceneNode.

Stubbed SceneLight
Converted indentation to spaces.