wumpus-basic

Copperbox revision 1779.

I've changed Plaintext to accommodate multi-line text, however, the changes cause a lot of problems. The type of Plaintext changes as it must access the drawing context for font-size and this stops (pseudo-)affine transformations working on it.

"Must access the drawing context" is not strictly true - with more careful coding I could probably avoid reading the drawing context until Plaintext is drawn. That said, the current code at least flags up problems I'll have to do some thinking about: what objects should support the pseudo affine transformations and how should I use lifters? Currently all drawing uses the lifters draw and drawi extensively, maybe this is not opportune.