v1.3 adds improved lighting / performance

With v1.3, Hot Tin Roof now has some very nice baked lighting. This both makes things look a fair bit sexier and noir'ier on high end, AND makes the game a lot, lot better looking on low-end. It also also improves performance across the board, especially on high-end.

There's also some... new hidden stuff to find. That we're not going to talk about yet. Even if you find it. But have fun! :D