[x3d-public] Don't hog graphics contexts in clients

[John Carlson]

Each X3D browser should consume one graphics context in a web browser.
I've heard that some people are using more that one graphics context per
browser?

Also, be sure you can switch scenes in your browser without consuming an
additional graphics context.

This will help me a lot.  Workarounds are welcome.

Thanks,

John
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