Save the current diagram layout

[antoineatstariongroup]

Prerequisites

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Description

Inside the PhysicalFlowView, the user should be able to save the current layout of the diagram inside the server, as a JSON file.
This file should store all information regarding the position of each node and the represented 10-25 Thing (reference to the iid).
The configuration file should be linked a specific Task (store all configuration related to a Task into a folder named by the id of the Task).

Steps to Reproduce

System Configuration

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