Simplify master JSON

[GMMULLER]

The master JSON should look like this:

{
    "variables": [
        {
            "name": "timestep",
            "value": "1"
        }
    ],
    "components": [
        {
            "id": "json_map",
            "position": {
                "width": [
                    1,
                    12
                ],
                "height": [
                    1,
                    4
                ]
            }
        }
    ],
    "grid": {
        "width": 12,
        "height": 4
    },
    "grammar_position": {
        "width": [
            1,
            5
        ],
        "height": [
            2,
            4
        ]
    }
}

Remember to modify the JSON schema, interface.ts, and grammar.md (documentation).

[GMMULLER]

• [x] Create JSON schema for maps and plots
• [x] Simplify JSON schema for master grammar
• [x] Modify interface.ts
• [x] The map schema should have a plot field for embedded plots.
• [x] Modify grammar.md