wumpus-core

Copperbox revision 2192.

I've specialized RotateAbout and its derived functions so the point-of-rotation has Double for the unit - i.e. it represents PostScript points.

This helps instances with more general units as they are translating into a specific type/unit rather than a polymorphic one. It also seems to make seems given that translate is fixed to PostScript points - rotate-about can be seen as a translate, rotate, then reversed translate.