Embedding Media: Photos, Videos, Audio

[candideu]

Is your feature request related to a problem? Please describe.

I would love the ability to embed media hosted elsewhere, besides uploading photos to the server.

Describe the solution you'd like

Ideally, this could be done by adding a block option for audio and video, where a direct link to the file hosted online could be pasted, and embedded to the page.

This would add the file using a <video> or <audio> HTML tag.

Having an iframe option and/or accepting HTML tags to be added could also empower users to add a wide variety of media to their pages.

Additional context
Related: #1068