Cmake help

Description

After working with @gang.tang.au today, I realised that typing all the files yourself by hand is painful. This adds some basic logging of information to avoid the amount of typing required.

Turns out that testing this is difficult, so there are a few other changes to ease that process.

Checklist

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Changelog item added to changelog/