Create a tag that will automatically embedded the viewer of media content that comes form a list of defined external sites.

Usage :
As a user, when I enter something like :

{{ExternalMedia=https://www.youtube.com/watch?v=4Q4684rqIzY}}

The page display the Youtube viewer embedded.

As a user, when I enter something like :

{{ExternalMedia=https://www.youtube.com/watch?v=4Q4684rqIzY|width=800|height=600}}

I can define the size of the embedded frame.

By doing this, we avoid security problems.

Example of external sites with whom the extension could work with:

• [Video] Youtube
• [Video] Vimeo
• [3D files viewer] Clara.io
• [3D files viewer] Sketchfab.com
• [3D files viewer] thingiverse.com