* Switch ARDMediathekBridge to JSON-API
The html screen scraping approach of ARDMediathekBridge did not work reliably. I could not find one show for which the item list was not empty using the html screen scraping approach.
The proposed change uses the JSON-API of the WebApp. Although there is still room for improvement (feed title, better understanding of the API, more accurate mimic of the webapp's behavior, de-pagination …), it does work with this change.
Indicate that now full URLs as well as just the ID are accepted.
