Day/Night cycle reworked... still iffy at points.. it makes strange jumps.. Possibly lerp function is acting up. Could be I missed some discontinuity between start/end positions etc
Fixed day/night cycle, no more jerky jumps and twitches. Also changed a few of the colors etc.
Added a "turn fog dark when it's night" feature in the skysphere.
Tweaked day/night cycle slightly; made fog color change together with ambient light. We now also compress normals using spheremap transform.