Enhancement to `staticScene` option

[mkhorton]

The scene component has a staticScene setting, which disables animation and mouse interaction, however it still requires an active WebGL context: this limits the amount of static images that can be rendered on a page at once.

It might be possible to create a component which can render a Scene, but returns an image. This could allow for an array of Scenes to be displaying on a webpage.

I believe this might already be possible in a hacked way via the imageRequest prop, but might be quite inefficient.