Add possibility to enable link to image in image syntax

Would be useful to be able to easily enable link to image directly in image syntax.

Could be something like:

[[image:${doc.fullName}@1.png||width="100%" link="true"]]

That way you don't need to find how to get the link on the image which already has to be resolved anyway to sho the image itself. Plus it sounds more consistent with the attachment behavior, that way image would be just a extended attachment that preview what it targets.