Added opacity (globalAlpha) support to PixelDrawer
Added opacity (globalAlpha) support to PixelDrawer

This will be useful for the future.

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