[RFC] Embed Extension

[colinodell]

Description

Provide an extension that generates embed codes for popular services like YouTube, GitHub Gists, etc.

The syntax will look like the image syntax, with the exception that the embed must be on its own line in the Markdown input.

In addition to handling popular services out-of-the-box, users should be able to easily define their own services.

Syntax

Any https:// on its own line would be considered embeddable content:

https://youtube.com/watch?v=zbA62fvGGyw

https://youtu.be/zbA62fvGGyw

https://gist.github.com/colinodell/ffdd892cedc43d07597cb73a9a72e668

But this would not, since the URL isn't on its own line:

Check out my favorite video: https://youtube.com/watch?v=zbA62fvGGyw