Cleanup: Remove scene frame macros (`CFRA` et al.)

Removes the following macros for scene/render frame values:
- `CFRA`
- `SUBFRA`
- `SFRA`
- `EFRA`

These macros don't add much, other than saving a few characters when typing.
It's not immediately clear what they refer to, they just hide what they
actually access. Just be explicit and clear about that.
Plus these macros gave read and write access to the variables, so eyesores like
this would be done (eyesore because it looks like assigning to a constant):
```
CFRA = some_frame_nbr;
```

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D15311

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/gpencil/gpencil_sculpt_paint.c b/source/blender/editors/gpencil/gpencil_sculpt_paint.c
index f25d5937ac4..b68240362c5 100644
--- a/source/blender/editors/gpencil/gpencil_sculpt_paint.c
+++ b/source/blender/editors/gpencil/gpencil_sculpt_paint.c
@@ -1013,7 +1013,7 @@ static void gpencil_brush_clone_add(bContext *C, tGP_BrushEditData *gso)
         gpl = CTX_data_active_gpencil_layer(C);
       }
       bGPDframe *gpf = BKE_gpencil_layer_frame_get(
-          gpl, CFRA, IS_AUTOKEY_ON(scene) ? GP_GETFRAME_ADD_NEW : GP_GETFRAME_USE_PREV);
+          gpl, scene->r.cfra, IS_AUTOKEY_ON(scene) ? GP_GETFRAME_ADD_NEW : GP_GETFRAME_USE_PREV);
       if (gpf == NULL) {
         continue;
       }
@@ -1336,7 +1336,7 @@ static void gpencil_sculpt_brush_init_stroke(bContext *C, tGP_BrushEditData *gso
   bGPdata *gpd = gso->gpd;
 
   Scene *scene = gso->scene;
-  int cfra = CFRA;
+  int cfra = scene->r.cfra;
 
   /* only try to add a new frame if this is the first stroke, or the frame has changed */
   if ((gpd == NULL) || (cfra == gso->cfra)) {