Improve ID generation for enum entries

[lanthaler]

No description provided.

[lanthaler]

I've added another small fix so that RFC2119 keywords do not get lowercased. I've also added the build so that you can merge everything easily.

Thanks a lot

[darobin]

Thanks a lot for the patch! I'm closing this PR without applying it due to issues with it, but I've taken the important parts of your patch and applying them directly so that you should normally have everything working the way you want.

I didn't take the PR because:

• It does two different things (the RFC2119 part is a separate issue, and already has a PR)
• There were a few strange things in the code, e.g. str.replace("") on its own.

Thanks a lot!

I'll ship a release later today.