Improvements, extensions and repairs to profile resolver

[wendellpiez]

Includes various improvements to profile resolution XSLT pipeline:

• Now accepts a runtime parameter assign-uuid that, when valid UUID format, is assigned to the resulting catalog.
• If this value is not provided, the available fallback methods are better:
  • reset UUID service
  • try Java utility (hey why not)
  • fail gracefully if UUID service is not available (e.g. under SaxonJS)
  • provide 'blank UUID' fallback when other methods fail.

Creating this PR as a WIP draft, so more to come (see below).

Committer Notes

As we build forward with specs and unit tests the profile resolver needs updates (here).

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Changes to Core Features:

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