[PATCH] Improved Water Rendering

[aeonios]

-Increases reflection and refraction texture sizes. -Changes the refraction function to be less extreme and to work better over a larger range of water depths. -Improves the reflection/fresnel function so that reflections fall off more naturally. -Reduces the intensity of sky reflections because the color is too extreme otherwise. -Reduces the distortion intensity for reflections to a more natural level.

-Cleans up the code a bit, removes old commented-out stuff and adds/improves comments in a few places.