Update Lattice to published version of Standard 232

[nealkruis]

• Update Metadata Data Group
• Move array length constraints
• Typing and linting fixes
• Handle IDs and References

[tanaya-mankad]

I see what's been going on with Schema variables defined inside the lattice module - it's what Python does, though I'll be (and Pylint will be) happier when anything we're using in Lattice is explicitly declared in Schema instead of creating a bit of a ghost class outside the class' own definition!