bb8719030d
As described in #122398, implement read and write support for a new attribute storage system. Currently this is only implemented to support forward compatibility; the format used at runtime isn't changed at all. That can be done one step at a time during the 4.5 and 5.0 development cycles. A new experimental option for testing tells Blender to always save with the new format. The main benefit of the new structure is that it matches the attribute system design, it allows for future attribute storage optimization, and each attribute is an allocated struct, which will give pointer stability for the Python API. The next step is to connect the attribute API and the RNA API to AttributeStorage for the simplest geometry type, point clouds. Pull Request: https://projects.blender.org/blender/blender/pulls/133874
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