wumpus-core

Copperbox revision 1674.

I've removed the classes Stroke, Fill, Ellipse and TextLabel from the Picture module. The methods they provided are now just implemented as non-overloaded functions. With recent changes to Wumpus-Core (simplification of StrokeAttr, unification on one colour type - RGBi) there is less need for overloading. It would still be useful to as it handles defaults quite well, however I decided I wanted a simpler interface - plus I'd like to use some of the class names in Wumpus-Basic.