Sky from KagzuGraphics: https://www.shadertoy.com/view/3Xjfzc
End, Nether, Underwater & Leaf detection from newb-x-mcbe by devendrn: https://github.com/devendrn/newb-x-mcbe
Skybox fix from newb-x-mcbe by devendrn: https://github.com/devendrn/newb-x-mcbe
Clouds from @michaellynx
