feature(concerto) Add new version of metamodel

[jeromesimeon]

Signed-off-by: jeromesimeon jeromesimeon@me.com

Changes

• Add new version of meta model, consistent with https://github.com/accordproject/web-components/pull/353
• New model adds:
  • 🐛 Fix to class declarations so they include fields!
  • 🆕 decorators to drive the new form-based editor
  • 🆕 regex checks on some of the names
• Additional changes:
  • Rename class name field from identifier to name
  • Refactored import classes to more easily distinguish between namespace.Type and namespace.*
  • Add distinction between Identified and IdentifiedBy consistent with Concerto 1.0
  • Made type references local names rather than fully qualified names

[jeromesimeon]

LGTM! There's the TODO regarding enums, but that can be handled separately.

I'm not sure I understand that TODO (at least in the context of the current Concerto). In other word, I tried to address this.