Build changelog menu dynamically (replace bash with D code)

[wilzbach]

Now that we have the ddoc_preprocessor, we can slowly remove all these old things.
Advantage of auto-generating these files is that less unrelated changes will pop up on a PR.

[dlang-bot]

Thanks for your pull request, @wilzbach!

Bugzilla references

Your PR doesn't reference any Bugzilla issue.

If your PR contains non-trivial changes, please reference a Bugzilla issue or create a manual changelog.

[CyberShadow]

What's "ZipException: no end record"? Another Dub failure mode?

[wilzbach]

Yes, but we fixed that one quite recently: dlang/dub#1339
That's also the reason for 2.078.2 ;-)

[CyberShadow]

Now that we have the ddoc_preprocessor, we can slowly remove all these old things.

Great!

Looks like it currently generates a broken link to 2.078.2_pre , is that intentional?

[wilzbach]

Looks like it currently generates a broken link to 2.078.2_pre , is that intentional?

Kinda - it mimicked the update_nav.sh script 1:1 and Martin typically hasn't run it for last beta releases. Though it has been done in the past and so I would put it in the "an additional step which has been accidentally forgotten but can't be forgotten anymore category".
Anyhow we fixed the prerelease pages to point to changelog/<ver>.html to have stable URLs a while ago.

While I updated the URL, I used it as an opportunity to improve the text for the preview item to:

Note that I also had to bump the DMD version on CircleCi - as interestingly the changelog is built by the release tool.

[CyberShadow]

Thanks!