Add Ui for Rules event handlers and per-bundle entities

Steps:
1. Change reaction-rule config to save the event as: events => { event_name => { array of event settings } }. This needs adaptions in tests, config entity and in the config schema. (
2. Change current UI code to incorporate the event form and write event form for bundle plugin
3. Test coverage to edit an event in the UI

There are some issues left, but as this covers the API change for multiple events I'll make sure this is committable and push the changes + open a follow-up for the rest.

ok, I fixed conflicts and did some basic fixes - still there are test fails we need to resolve before being able to merge this. My changes are at https://github.com/fago/rules/pull/430 and https://travis-ci.org/fago/rules/jobs/114230913

make sure to fix the file permissions in your drupal installation. the web server user must have write access to the sites directory where it creates the test site directory.

Do we still need this one? Maybe someone could pick it uo again?

I'm posting the patch here so the testbot can look at it and we can continue development.

This is https://patch-diff.githubusercontent.com/raw/fago/rules/pull/472.patch which was last modified on 7 March 2016.

As far as I can tell, much of the code in the PR and the above patch was already committed as part of #2658842: Add support for Rules event handlers and per-bundle entities on 25 Feb 2016. Sorting out what remains to be completed is going to be a pain.

This issue largely overlaps with the two child issues and greatly overlaps with the already-closed parent issue. I'm inclined to just identify the unfinished tasks from those three and this issue and move them all into a new meta.

I already have a lot of this work completed on my local, so I will create the new meta when I'm ready to post that patch.

Made changes to the issue summary. I'm still sorting out what has been done and what still needs to be done here.

Removed task 3 from the issue summary. See my reasoning in #2676514: UI test coverage for adding an event with per-bundle entities. Specifically, Javascript testing IS possible in core Drupal at this time so there is no need to have a separate issue for the tests - tests should be included with any patch in this issue.

Added link to issue for task 2.

All steps in the original post have been addressed. Nothing left to be done.