Iris now uses the new Mantle System instead of the Parallax system. They both do roughly the same thing (store data about non-generated chunks & prevent cascading, however the mantle supports far more types of data interacting with each other which will allow future improvements to Iris Objects
Fixed a lot of issues with the pregenerator & setup commands.
Thread safety in object writing has made Iris generate in a more reliable way, though until some optimizations, pregen performance is about 15% slower, however normal chunk generator performance is still very fast given what Iris is generating