[x3d-public] Progress on es6 proto expander

[John Carlson]

Made progress on es6 proto expander today.   Implemented deep expand on all
classes.   Fixed enum testing to handle use=“required”    If not required
log, else return null.   Should throw an exception.  Example scenegraph
copied correctly.

Next steps:   Copy ProtoBody child into ProtoInstance slots.   Create a
visitor pattern to pass around global classes, or create a singleton for
declarations and scoping items.   No surprises yet.

Desired:   JSON reader or XML reader so we don’t need X3dToES6.xslt.
Contributions?   Give us your method names, then start hacking on
packageGenerator.py in www.web3d.org/x3d/stylesheets/es6 on sourceforge.

John
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