I think the new chunk-based water simulation is almost done! Still need to deactivate stale chunks & update the lower LODs, but the base sim works perfectly now, integrated with water bodies created by the world generator.

One 16x16 water chunk takes ~3us to update, so I can update, say, 300 of these in under 1ms, which is pretty great. I was planning to optimize it further with SIMD, but I guess I'll postpone that a bit, it already runs fast enough.

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