wumpus-basic

Copperbox revision 1904.

I've updated the demos included in the Hackage release to compile without warnings. I'll probably make a release of the current version once I've written a "status report" for it. While Wumpus-Basic is still very rough - the latest version is probably even less polished that the previous one, though it adds a lot of new features - the Wumpus-Core version on Hackage could do with being updated.