Restore legacy datatypes

[david-waltermire]

Committer Notes

This PR adds back the legacy camel-case data types removed in #561 and #562.

This will restore use of these types, which are still used in OSCAL.

This PR also includes:

• Refactored module constraints to fix Metapath errors.
• Removed keyword checks in names added by Add constraints warning against using Metapath keywords as names #542, which is not needed, since these names are actually allowed.

This PR builds on the following prior PRs, which should be merged first.

• Feature/module and meta constraints namespace prefixes #686
• Static Analysis Results Interchange Format Metaschema module #659

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[david-waltermire]

This should be merged using "rebase and merge" to avoid merge conflicts in downstreams.