and ideas on how the configuration dict can be read from the json
and how the gadgets can be instanciated with some configuration so that we have
generic gadgets with some dynamic configuration in the json (for example
spreadsheet columns)

Graph editor gadget calls an acquired method "notifyDataChanged" on its
parent gadget.

Machine to be able to give an entity even if it is interrupted (if deliverOnInterruption is set as true in the input)