Codegen

[RS-Credentive]

Committer Notes

This PR updates the names of some of the datatypes with the latest metaschema datatype names. This change is necessary for the metaschema XML files to be properly validated against metaschema.xsd

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[RS-Credentive]

Michaela, as requested - my PR is rebased against develop

[iMichaela]

Michaela, as requested - my PR is rebased against develop

Thank you. It looks good now. I'll work on it today (test/approve)