forked from: Optimized Minecraft4kAS xmas2

ported from notch's javascript version: http://jsdo.it/notch/dB1E
added some brightness change (shadow) on top of the tiles if needed.
added water and waterlevel input
added fake (and wrong) ambient shadow
changed fog as yonatan did: http://wonderfl.net/c/dl6u
added some flora (bushes) and flora input
caves
optimized
winter theme
fixed ambient shadows
light bulb added
darker colors shifted to blue
edit -> wmode = direct (~5 frame gain)