Convert the last 'special' case, the Rex edge sticker, to the generic sticker mechanism.
New sticker mechanism: improvements for concave stickers.
Convert the Rex corner sticker to the new mechanism.
Remove debugging.
Generalize FactorySticker - make it possible to draw stickers whose sides are curved.Convert the Ivy to use this new functionality.
improvements for FactorySticker
Move all the special cubit-creating code out of FactoryCubit and to the Object classes, and thus hopefully finish implementing the new cubit creating engine.
Move Factories to the 'helpers' package.