Also add some tweaks to the process-model script that I managed to lose.

Entities derived from models can now have volumes

This also updates the model-processing script to automatically
insert the model data into the appropriate source file.

These use a new entity-maker.

Also switches to using localeCompare

It needed offsets to handle the rings.

This was causing errors on Safari.

Entities now have their templates cloned (by serializing and parsing) to allow for
a single object to be passed in repeatedly.