qmlsc: Support JS object literals

import QtQuick

Window {
    width: 640
    height: 480
    visible: true
    title: foo()

    function foo(): string {
        let jsObj = {"key": "value"}
        return jsObj.key
    }
}

// cpptypes.h
class MyValueType
{
    Q_GADGET
    QML_VALUE_TYPE(myValueType)
    QML_STRUCTURED_VALUE
    Q_PROPERTY(double d MEMBER d)
    Q_PROPERTY(QString e MEMBER e)

    double d;
    QString e;
};

// Main.qml
import QtQuick
import MyModule

Window {
    width: 640
    height: 480
    visible: true

    property myValueType v: ({d: 4.4, e: "a string"})

    Component.onCompleted: console.log(v)
}

import QtQuick
import QtQuick.Controls.Fusion
import Qt.labs.qmlmodels

Window {
    width: 640
    height: 480
    visible: true

    TableView {
        anchors.fill: parent
        columnSpacing: 1
        rowSpacing: 1

        model: TableModel {
            TableModelColumn { display: "name" }
            TableModelColumn { display: "color" }

            rows: [
                {
                    "name": "cat",
                    "color": "black"
                },
                {
                    "name": "dog",
                    "color": "brown"
                },
                {
                    "name": "bird",
                    "color": "white"
                }
            ]
        }

        delegate: TextField {
            required property string display
            text: display
            readOnly: true
        }
    }
}