Clouds move with the player

This is made easier to see when viewing terrain that reaches above cloud level (the seed "14w29b" has savanna M near spawn).

Look at where the terrain intersects with the clouds. Then, fly up and down. The clouds move up and down as well. The clouds also move to the side when the player moves to the side.

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(Partial) code analysis by jonathan2520 can be found in this comment.