49f676e6c2
Pointers to hide status layers and custom data are removed, since they can be accessed from the mesh as necessary. Usage of other arrays has been reduced, so the pointers can eventually be removed. The reasoning is the same as some other commits in this area: the goal is less duplication of state, and a more focused design of the responsibilities of the PBVH class. Some of the changes are fairly noisy, since we need to add arguments to functions in a few places. On the nicer side of things, some functions for syncing the state can be removed. Not retrieving hide layers with write access also has performance implications in some cases, since it means the original arrays can be reused without a copy when they're shared.
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