Allow redefinition of formal-name and description in flag, field, and assembly references

[david-waltermire]

User Story:

As a Metaschema-based model author, I want to override the formal-name and/or description in a flag, field, or assembly reference to reflect more fine-grained naming and semantics for where a definition is (re)-used as compared to where it is defined.

This feature will allow generated documentation to better reflect the local semantics at the point of definition use.

Issue usnistgov/OSCAL#1129 and PR usnistgov/OSCAL#1171 are related examples of where this can be used.

Goals:

• Allow a flag, field, or assembly reference to optionally redefine a formal-name or description.
  - [ ] Support redefinition of formal-name and description in flag, field, and assembly references metaschema-xslt#26

Dependencies:

None.

Acceptance Criteria

• All website and readme documentation affected by the changes in this issue have been updated. Changes to the website can be made in the docs/content directory of your branch.
• A Pull Request (PR) is submitted that fully addresses the goals of this User Story. This issue is referenced in the PR.
• The CI-CD build process runs without any reported errors on the PR. This can be confirmed by reviewing that all checks have passed in the PR.

[david-waltermire]

The metaschema schema has been modified to support this for assembliy, field, and flag references.