async include(url2, uiOptions) {
    await _ui.include(url2, uiOptions);
  }
ASYNC: Include HTML fragment, img, video, text, json, form data, pdf or anything else from an external file or API
Wraps the included object in a div tag.
PDF's, text or unknown MIME types are also wrapped in an iFrame.
@param {string} url The URL of the source file to include
@param {object} uiOptions Object containing properties recognised by the _uiReplace function. Must at least contain an id
param {string} uiOptions.id The HTML ID given to the wrapping DIV tag
param {string} uiOptions.parentSelector The CSS selector for a parent element to insert the new HTML under (defaults to 'body')