new releases - wumpus-basic-0.20.0 & wumpus-drawing-0.5.0

Copperbox revision 2536.

New releases for Wumpus-Drawing and Wumpus-Basic.

I won't be making a version of Wumpus-Tree to match these releases as I consider them somewhat interim releases. There are a lot of changes in Wumpus-Basic, which is why I want to put out a new release; but the changes haven't really been consolidated in Wumpus-Drawing. If I waited until I had a consolidated release of Wumpus-Drawing, the change delta may be huge, so putting out the current interim seems preferable.

Wumpus-Basic-0.20.0
Wumpus-Drawing-0.5.0