This PR addresses a few separate issues...

1. Renaming [setup.dictionaries] and [local_server.dictionaries] to the config_stores equivalent.
2. Warning the user if their config contains [setup.dictionaries] and provide relevant remediation steps.
3. Splitting the manifest package up into separate files for easier maintenance.
4. Refactor the manifest tests.
5. Refactor the manifest Read() method, which includes...
   • Removing a bug fix for a very old v0.25.0 issue.
   • Not auto-updating manifest_version (it made incorrect assumptions about manifest interface changes).
6. Updating error remediation message to reference the correct documentation link.

WARNING: We've bumped manifest_version to a new version 3 but we're waiting for @triblondon to land an internal documentation update that bumps the version before we cut a new release.