wumpus-core

Copperbox revision 1847.

I've shifted the "font delta' SVG optimization into the Primitive type from the Picture type. As Wumpus-Basic at least builds with Primitives much more than Pictures this should give some room to use the optimization more often.

I still haven't looked at improving the concatenation of Primitives - this will mean replacing the OneList with a JoinList. Fortunately I have a JoinList ready made.