- Replace BKE_brush_getactive_gpencil -> BKE_paint_brush (no need for per-paint-type brush access). - Rename TOT_GP_EDITBRUSH_TYPES -> GP_EDITBRUSH_TYPE_MAX (avoid sharing prefix w/ unrelated constants). - Rename instances of `GP_EditBrush_Data` to 'gp_brush' (`Brush` is typically called 'brush').