IMG-SYS: New method

Seems the image is actually 2-bit. Not sure on the exact bit->color
mapping, but now it will look more correct.
Also, the converted image now matches the extracted texture of a running
game.
KH2 Image Editor: Add font support

+ Added support for 0x24-type font images.
Remove project IMG-SYS

- IMG-SYS has been integrated into KH2 Image Editor