Option to embed external xlink:href URLs as base64 encoded

[hyanwong]

If canvases use drawImage with a URL, it would be nice to have to option of embedding the images as base64 instead of linking to them. If I made a pull request with such an option, would it be likely to be accepted?

[justinharrell]

I also did this but approached it a little differently, uses XHR to get original image and uses defs to resuse images, helps with repeating images and svg images.