Changed light values to integers.

Tweaked sun lighting, atmosphere, and fog.

Updated textures, changed lights. Please tell me if any problems show up.

Made raven spawn prettier.

Fix pathfinding??

First performance pass, because I'm an idiot.

1: Removed many redundant out-of-bounds trees, replaced them with filler trees.

2: Reduced light radius on all lights, removed one large-radius light.