JSON structure for downloading students' response data

[smmercuri]

Currently responses are recorded in the following format:

"Seed: n; ans1: ""..."" [score]; prt1: # = 1 | prt1-1-T"

To make parsing this more routing in offline analysis, creating an optional JSON equivalent of this would be beneficial. For example

{
    "Seed": "n",
    "inputs": {
        "ans1" : {
            "value" : "...",
            "status" : "score"
        },
        "ans2" : ... 
        },
    "prts" : {
        "prt1" : {
            "score" : "1",
            "node" : "prt1-1-T"
        },
        "prt2" : ...
        }
}

[sangwinc]

@smmercuri, thanks for raising this. I suggest you start with this method to create a JSON object.
https://github.com/maths/moodle-qtype_stack/blob/dev/question.php#L770
We can then decide how to give a teacher access to this method, e.g. adding functionality to the analysis script
https://github.com/maths/moodle-qtype_stack/blob/dev/questiontestreport.php