Allow for other embedded media types - like SoundCloud playlist

✋ Feature Requests
1

I would like to at least have a possiblity to create block with just a url (with some validation of url string).

In my case iframe tag look like:

<iframe
              width="100%"
              height="300"
              scrolling="no"
              frameborder="no"
              allow="autoplay"
              src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/playlists/860325395&color=%23ff5500&auto_play=false&hide_related=false&show_comments=true&show_user=true&show_reposts=false&show_teaser=true&visual=true"
            ></iframe>

So actually I only care about this url in my model.