Function sceneToJSON

docs/app/js/sanddance-app.js:123140–123142

(scene, indent)

    "ariaRoleDescription" // aria
];
function sceneToJSON(scene, indent) {
    return JSON.stringify(scene, keys, indent);
}
function sceneFromJSON(json) {
    const scene = typeof json === "string" ? JSON.parse(json) : json;
    return initialize(scene);