a buncha changes, and improvements to the ai navigation

Cleaned up the inarticulate mess of ai nodes and redistributed them better, which should improve performance, and compile faster, adjusted skybox stuff, made the hidden room accessible without noclip, added ladders to some of the buildings, fixed the misaligned texture on the one building, added some things to the hidden room, adjusted overall lighting, adjusted light and sun angles.

fixed a wierd lighting bug, made hdr less horrendously bright(maybe a little too much) cubemaps are still nightmarishly bright which i can't seem to fix yet because im braindead

Initial addon creation.