Add explicit handling of slots to `BKE_animdata_transfer_by_basepath()`, and modernise the code to use the new API. No functional changes for legacy Actions. Ref: #123424 Pull Request: https://projects.blender.org/blender/blender/pulls/128088
Add explicit handling of slots to `BKE_animdata_transfer_by_basepath()`, and modernise the code to use the new API. No functional changes for legacy Actions. Ref: #123424 Pull Request: https://projects.blender.org/blender/blender/pulls/128088