Move the contents of `BKE_action.h` into `BKE_action.hh` and remove C-isms. No functional changes. Pull Request: https://projects.blender.org/blender/blender/pulls/127407
Move the contents of `BKE_action.h` into `BKE_action.hh` and remove C-isms. No functional changes. Pull Request: https://projects.blender.org/blender/blender/pulls/127407