Varnish WELSPECS Report Implementation

[bska]

In particular,

• Split long lines.
• Switch to initialising objects, especially references, using assignment syntax (=) instead of construction ({}).
• Move function opening braces to next line.
• Remove blanks before semicolons.
• Apply const where reasonable.
• Move static objects into function-local scopes where reasonable.
• Reverse conditionals to enable "early continue".
• Rename workers::write_WELSPECS() to workers::wellSpecification().

This is in preparation to replacing hard-coded date stamps with dynamic information.

[bska]

I'm creating this PR in draft mode because it depends on, and contains, the earlier PR #4526. I will keep the PR in a draft state until such time as it is ready for review and merging.

[bska]

The upstream PR was merged into the master branch. I'm marking this work as "ready for review".

[bska]

jenkins build this please

[bska]

jenkins build this please

[bska]

PR approved and build check is green. I'll merge into master.