MM-231 Support config for which tab in sidebar is selected on map startup

[rogup]

Closes #231

[wu-lee]

Experimenting with rebase and how it interacts with PRs.

I've:

• rebased the branch to the top of dev
• This has resulted in some commits being de-duplicated. (Those to do wit the git CI pipeline added in both, and the MacOS script fix.) In a minor difference between the branch commit f640d0d86c878bdcc and the one it reported being cherry-picked from, I infer the main branch one was the correct version (it lacked the npm run build --if-present command), and selected that version.
• I moved the .prettierignore commit to the top (this is not really part of the PR remit and at least warrants being separated - maybe it can live on master)
• I merged the two commits altering the config - "Add defaultPanel option to config" and the subsequent one, the first one with Prettier changes, and the second one reverting Prettier changes. This made the actual changes clear.
• I split out the stylistic changes from "Add defaultPanel option to config" into a prior commit, and followed through - removing all trailing semicolons.
• I also split the desc: field description corrections into a prior commit.

Pushing this back, beware, the branch will have moved. But this PR has adapted accordingly. Good.

[wu-lee]

I've added some typesafety - seems sensible and idiomatic in this case. Tweaked and regenerated the docs accordingly. Everything appears to work as before, tests pass.

[wu-lee]

I think this is ready to merge? If @rogup you are ok with what I've done above?

[rogup]

@wu-lee thanks for making those changes. I think this is probably ready to merge, once I've tested it on the DotCoop and ICA maps