[demo] Back to Color by AntonioND

A demo for the Gameboy Color - now that's something you don't see every day. It was made for the GBDev 2014 coding compo, which is still accepting submissions for a few more days.

The demo itself may have some room for improvements, but I'm just too happy to see a prod on this platform to not post it.

Get the binary at pouet.

Also AntonioND was kind enough to release the source of the demo on Github. Even more extra props for also releasing the OpenMPT -> GBC converter used to create the music for this demo.