FrontEnd: Need to organize the ecutwfc covnergence data in a new way

[kirk0830]

Now the rendering of figures is under refactor, a new logic of organizing data is needed for now.
Old one is like:

{
    "mp-730101.cif: GBRV v1.5 ": {
        "de": [
            0.013860997587499924,
            0.00045393537499904824,
            0.00010070378749915676,
            7.142224999867608e-05,
            6.570483749968048e-05,
            6.023726249893002e-05,
            4.347770000023843e-05,
            2.9336999999074465e-05,
            2.69097499998594e-05,
            1.931418749911984e-05,
            0.0
        ],
        "dp": [
            -2.015739,
            -0.10332100000000022,
            0.0006149999999998101,
            0.003089999999999815,
            0.00332599999999994,
            -0.000532000000000199,
            -0.0007270000000003662,
            0.0019689999999998875,
            0.001042999999999683,
            0.0019929999999996895,
            0.0
        ],
        "dbs": [
            0.0028276580183703086,
            3.2813302093257655e-05,
            5.28055468388865e-05,
            1.1733835776123594e-05,
            8.512287915329846e-05,
            8.039449128287346e-05,
            1.9697822895521253e-05,
            4.6865742849758105e-05,
            6.503236572552103e-05,
            2.0006503497886892e-05,
            0.0
        ],
        "iconv": 2,
        "ecutwfc": [
            20.0,
            30.0,
            40.0,
            50.0,
            60.0,
            70.0,
            80.0,
            90.0,
            100.0,
            150.0,
            200.0
        ],
        "zvals": [
            1
        ]
    },

The new one requires data organized as object/instance, therefore for the first obj, all data will be its attributes, thus the key will be changed into:

[
    {
        "system": "mp-730101.cif",
        "ppcase": "GBRV v1.5",
        "de": [
            0.013860997587499924,
            0.00045393537499904824,
            0.00010070378749915676,
            7.142224999867608e-05,
            6.570483749968048e-05,
            6.023726249893002e-05,
            4.347770000023843e-05,
            2.9336999999074465e-05,
            2.69097499998594e-05,
            1.931418749911984e-05,
            0.0
        ],
        "dp": [
            -2.015739,
            -0.10332100000000022,
            0.0006149999999998101,
            0.003089999999999815,
            0.00332599999999994,
            -0.000532000000000199,
            -0.0007270000000003662,
            0.0019689999999998875,
            0.001042999999999683,
            0.0019929999999996895,
            0.0
        ],
        "dbs": [
            0.0028276580183703086,
            3.2813302093257655e-05,
            5.28055468388865e-05,
            1.1733835776123594e-05,
            8.512287915329846e-05,
            8.039449128287346e-05,
            1.9697822895521253e-05,
            4.6865742849758105e-05,
            6.503236572552103e-05,
            2.0006503497886892e-05,
            0.0
        ],
        "iconv": 2,
        "ecutwfc": [
            20.0,
            30.0,
            40.0,
            50.0,
            60.0,
            70.0,
            80.0,
            90.0,
            100.0,
            150.0,
            200.0
        ],
        "zvals": [
            1
        ]
    },
]