add some svg to javadoc

Basic svg generated for the javadoc using https://github.com/talsma-ict/umldoclet

the integration is not completely clean (maybe because of the java modules) and requires a small hack to move the generated images to the correct folder.

Additionnaly, these images aren't directly embedded in the javadoc so it require to add <img src="NAMEOFTHECLASS.svg ... information in all the files (and images aren't clickable)

However, this is much better than the simple javadoc 😄