Review possibility of using course editor to apply actions

[PhMemmel]

With the rework for moodle 4.0 we still are using the PHP methods and a form submit to execute the selected action.

If we have a course format using the new courseindex we theoretically could use the course editor to apply these actions. This would avoid a page reload. Currently the course editor does not fully support using hide/show etc. (only moving as far as I could see, but we would have to reimplement all of the sort logic in this case on JS side).

This issue was raised to have another look by the time most common course formats have adapted to the new courseindex. By that time we could have another look at this possibility. However: Only advantage would be to avoid a site reload which isn't that big of a deal for a bulk action plugin.