Field component attribute

[masonlr]

Add "component" attribute on each field. The attribute is used to specify the type of component rendered in the front end, for example:

• "component": "slider"
• "component": "heading"

An example JSON serialisation of a field with the component attribute is

{
    "child_fields": [],
    "component": "slider",
    "name": "wall_velocity",
    "specs": [
        {
            "id": 59,
            "name": "min",
            "value": "0.1"
        },
        {
            "id": 60,
            "name": "max",
            "value": "2.0"
        },
        {
            "id": 61,
            "name": "step",
            "value": "0.01"
        },
        {
            "id": 62,
            "name": "default",
            "value": "0.5"
        },
        {
            "id": 63,
            "name": "units",
            "value": "m/s"
        }
    ]
}