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, 4 insertions, 4 deletions

diff --git a/source/blender/editors/mask/mask_shapekey.c b/source/blender/editors/mask/mask_shapekey.c
index 55145f27012..48944c081a8 100644
--- a/source/blender/editors/mask/mask_shapekey.c
+++ b/source/blender/editors/mask/mask_shapekey.c
@@ -33,7 +33,7 @@
 static int mask_shape_key_insert_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Scene *scene = CTX_data_scene(C);
-  const int frame = CFRA;
+  const int frame = scene->r.cfra;
   Mask *mask = CTX_data_edit_mask(C);
   bool changed = false;
 
@@ -76,7 +76,7 @@ void MASK_OT_shape_key_insert(wmOperatorType *ot)
 static int mask_shape_key_clear_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Scene *scene = CTX_data_scene(C);
-  const int frame = CFRA;
+  const int frame = scene->r.cfra;
   Mask *mask = CTX_data_edit_mask(C);
   bool changed = false;
 
@@ -122,7 +122,7 @@ void MASK_OT_shape_key_clear(wmOperatorType *ot)
 static int mask_shape_key_feather_reset_exec(bContext *C, wmOperator *UNUSED(op))
 {
   Scene *scene = CTX_data_scene(C);
-  const int frame = CFRA;
+  const int frame = scene->r.cfra;
   Mask *mask = CTX_data_edit_mask(C);
   bool changed = false;
 
@@ -214,7 +214,7 @@ void MASK_OT_shape_key_feather_reset(wmOperatorType *ot)
 static int mask_shape_key_rekey_exec(bContext *C, wmOperator *op)
 {
   Scene *scene = CTX_data_scene(C);
-  const int frame = CFRA;
+  const int frame = scene->r.cfra;
   Mask *mask = CTX_data_edit_mask(C);
   bool changed = false;