Overgrowth Alpha 169 changes - Wolfire Games

- Rolls are less effective at moving up slopes - Added invisible forcefield at edge of the world - New uniform scale - New trackball rotation - Added notifications for out-of-date shadows, ao, nav mesh - Fixed normal map problem with detail objects - Added overbright option to detail objects - Added normal_conform detail object parameter - Added detail object angle jitter - Undo/redo works with sun editor - Updated angelscript and added string utilities