Petra Engine now its own thing

The engine behind Post Apocalyptic Petra (which i decided to call "Petra Engine" :-P) is now its own project that hopefully will make it slightly easier to start new retro 3D game projects:

http://runtimeterror.com/tech/petra/

Post Apocalyptic Petra itself is still using its own copy though eventually i'll convert the code to use the version from the site above instead of its own.