Don't rely on displayIds for SBOL parsing

[dany-fu]

The displayList object has an id field that should be used instead of name. Name should only be used in the final rendering to the user

[cjmyers]

I would add to this that the id field should likely be generated by VisBol. Likely the best approach would be to keep a list of SBOL URIs (identities) that map to a specific displayList id. This will enable us to support mapsTos eventually.