[Bf-committers] Mesh pointers removal refactor

[Hans Goudey via Bf-committers]

Hello!
 
I wanted to give a heads up to developers about a recent change to meshes.
The change affected 233 files-- almost anything that touches mesh data.
Previously you would generally access mesh data with pointers like `Mesh.medge`.
Those were redundant since the data is stored elsewhere anyway (in 
`CustomData`),
and they caused problems with future copy-on-write improvements.
 
Now mesh data is retrieved with a C++ API like `Mesh::edges()` or a C API like
`BKE_mesh_edges(mesh)`.
 
There may be performance implications for the Python API, but so far we have
mostly observed improvements. I hope most questions are addressed by the tasks
and commit below, but let me know (in chat?) if I can clarify anything!
 
Commit:
* https://developer.blender.org/rB05952aa94d33eeb
Tasks:
* Copy on Write: https://developer.blender.org/T95845
* Struct of Arrays Refactor: https://developer.blender.org/T95965
 
Cheers,
Hans Goudey
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