display/edit compact RDF representation

[bourgeoa]

Actually source-pane displays the file content as is.
This content may not be easily readable or editable (example : with CSS turtle that mostly expanded)

After displaying the as is content, a toggle option could allow display and/or edit of a compressed version of the RDF resource with the same contentType. This will be more human user friendly.

Both edit way will be possible on as is and on compressed. The edited version will be stored.