The source project of this merge request has been removed.
games: Add gog-torchlight2.
This MR adds Torchlight II, an ARPG like Diablo. I had some trouble getting it to use the ogre package in Guix, so I'm still using the bundled Ogre. I also spent quite some time packaging CEGUI before I realized that every game that uses it probably configures it differently. So I'm using the bundled CEGUI too.