vislcg3: 0.9.8.10063 (new formula)

Add formula for [VISL CG-3](http://beta.visl.sdu.dk/cg3.html), an implementation and evolution of the Constraint Grammar formalism by Tino Didriksen.
I don't see a need for using the `stable do` and `head do` constructs here. It's sufficient to just use `url`, `sha1` and `head`.