Fix for smart Koopa, shell sprites in Underworld
Fix for smart Koopa, shell sprites in Underworld

Fixes #76.

daivee/FullScreenMario,ajrulez/FullScreenMario-1,eross/FullScreenMario,bx5974/FullScreenMario,rmallols/FullScreenMario,eross/FullScreenMario,bx5974/FullScreenMario,janson123/FullScreenMario,ogregoire/FullScreenMario,bx5974/FullScreenMario,rmallols/FullScreenMario,vaikan/FullScreenMario-JSON,ogregoire/FullScreenMario,shuidong/FullScreenMario,andrewerb/FullScreenMario,vaikan/FullScreenMario-JSON,shuidong/FullScreenMario,andrewerb/FullScreenMario,janson123/FullScreenMario,vaikan/FullScreenMario-JSON,daivee/FullScreenMario,chensj1901/FullScreenMario,sushilkumaraitian/FullScreenMario,shuidong/FullScreenMario,sushilkumaraitian/FullScreenMario,sushilkumaraitian/FullScreenMario,ajrulez/FullScreenMario-1,chensj1901/FullScreenMario,rmallols/FullScreenMario,daivee/FullScreenMario,chensj1901/FullScreenMario,eross/FullScreenMario,janson123/FullScreenMario,andrewerb/FullScreenMario,ogregoire/FullScreenMario,ajrulez/FullScreenMario-1