wumpus-shapes

Copperbox revision 1740.

I've updated Shapes to use the new types and drawing primitives from Wumpus-Basic.

Ideally Shapes should be moved into Basic, but currently the code is mostly horrible - particularly, there is a lot of almost duplicated code for manipulating individual shapes. Having Shapes in Wumpus-Basic would spur on the development of connectors - supporting usable connectors rather than the current single, proof of concept would be a major step forward.