Allow element JS options to be overridden.

Follow-up to #2859002: Pass custom settings to international telephone behavior

Problem/Motivation

Most JS elements allows for a variety of options/settings that are not exposed via the UI, because it can be very difficult to support every possible option/settings.

Proposed resolution

Make sure that all JS element options can be easily overridden.

All JS element options will be moved into a Drupal.webform.ELEMENT_TYPE.options namespace which can be overridden using the JS global or form specific injector.

Drupal.webform = Drupal.webform || {};
Drupal.webform.ELEMENT_TYPE = Drupal.webform.ELEMENT_TYPE || {};
Drupal.webform.ELEMENT_TYPE.options = Drupal.webform.ELEMENT_TYPE.options || {
    'SETTING': VALUE
};