Possible ECA config entity optimisations

Yes and yes. I would gladly merge this.

OK, I'll create the MR as soon as 🐛 Privacy policy link goes to a 403 Active has landed. Otherwise, we may run into strange issues.

Now that the related issue got merged, I get started on this one.

And the good news on top: ECA 2.1.0 has just been released, as well as BPMN.io - so I can bump their constraints across Drupal CMS at the same time as well.

Idea: while we're at it, let's update our top level .gitignore rules to exclude any eca.model.*.yml files. That way we don't accidentally commit more of them!

And a question: if we are removing the models, does this mean we can also remove bpmn_io from our dependencies (although we should keep it as a dev dependency in dev.composer.json)?

Adding eca.model.*.yml to .gitignore makes sense.

But bpmn_io should be kept for end users. @pameeela was keen to have this available for end users so that we don't keep the fancy features in the dark but expose them to the site builder.

What we've implemented in the bpmn_io modeller is the so-called upstream conversion. So, without having the proprietary XML data available, we're now able to re-create that from downstream. So, the ECA models are still editable with BPMN.io without any further action required by the user.

This MR is now ready for review.

Gotcha. We're eventually planning to have a drupal_cms_dev_tools recipe, which would enable advanced stuff like Views UI. That'd be a great place to also depend on, and enable, BPMN.io. But that recipe doesn't exist yet, and won't until after 1.0.

This MR looks good to me.

Great clean-up! No more inscrutable walls of XML here. Merged with glee into 1.x. Thanks!

phenaproxima → credited lammensj → .

Crediting @lammenjs on @jurgenhaas' blessing. From Slack:

credit goes to @Jasper Lammens who implemented that upstream conversion. His use case is even more exciting: he lets AI create ECA models, which works to create the pure ECA model in YML. But if you want to edit that AI output, you need to have the BPMN data, and that's what he implemented. I'm thrilled about that