Add images (and figures)

[JSAbrahams]

Is your feature request related to a problem? Please describe.
It would be nice to have figures or images we can insert.

Describe the solution you'd like
Have a directory where we can store figures into multiple libraries, similar to how Zotero allows us to store references and organize these in libraries.
We can then uses these images in any Journal we please.

On load, the images should then be inserted.
We will need to take care with positions and what we do when an image is not available.