cat-log: include version control info

[MetRonnie]

• Allow --file v for the log/version/vcs.json file
• Include log/version/ contents in list-dir mode

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• No dependency changes
• Tests are included (or explain why tests are not needed).
• Changelog entry included if this is a change that can affect users
• Docs PR not needed
• If this is a bug fix, PR should be raised against the relevant ?.?.x branch.

[oliver-sanders]

One review will do for this.