csa_units should be renamed

[Ryan Schimpel]

As we are moving towards having Symphony open source, we should probably make this GenModel directive have a more neutral, impartial name (like "symphony_units").

I will consult to determine the best alternative name that fits this criteria.

[Ryan Schimpel]

Note: This String literal is defined in org.eclipse.symphony.common.emf.EcoreConstants (which probably should be renamed as well since we aren't using Ecore anymore)

[Ryan Schimpel]

All references to ''csa'' in the Symphony annotations have been changed to ''symphony''. As such, all future unit annotation should be ''symphony_units=...'' instead of ''csa_units=...''; this is important because the ''csa_units'' annotation will no longer work correctly.

All changes have been pushed to Git