Provide a Break block by default.

[thefirstfloor]

Most experiments would want a break moment in the experiment.
This is not provided by default in the framework, you need to have break Xblock in the editor and set it up in the config files.

If the experimenter only has access to the config files, and not (want to dive) the code, it's not possible to add a break in the session-sequence.json which gets picked up.

Suggestion:
Add a default break-buildin Xblock, that can also run without any .json file for ease of use.