This PR establishes the beginning of the transition to data-oriented code
for sculpt brushes described in #118145. The final brush "API" design is
still in progress, and further iteration will be required as more brushes are
refactored and other areas can be cleaned up.
Currently the main goal is making the code paths more obvious and easing
future development, but this change itself may also give a performance
improvement. In a simple test with a large mesh, that was about 14%.
Co-authored-by: Sergey Sharybin <sergey@blender.org>
Pull Request: https://projects.blender.org/blender/blender/pulls/121835
782f3411d0