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/transform/transform_mode_timescale.c b/source/blender/editors/transform/transform_mode_timescale.c
index 4130f6dc034..1474bc4591a 100644
--- a/source/blender/editors/transform/transform_mode_timescale.c
+++ b/source/blender/editors/transform/transform_mode_timescale.c
@@ -59,7 +59,7 @@ static void applyTimeScaleValue(TransInfo *t, float value)
        * (this is only valid when not in NLA)
        */
       AnimData *adt = (t->spacetype != SPACE_NLA) ? td->extra : NULL;
-      float startx = CFRA;
+      float startx = scene->r.cfra;
       float fac = value;
 
       /* take proportional editing into account */
@@ -107,7 +107,7 @@ void initTimeScale(TransInfo *t)
   t->mode = TFM_TIME_SCALE;
   t->transform = applyTimeScale;
 
-  /* recalculate center2d to use CFRA and mouse Y, since that's
+  /* recalculate center2d to use scene->r.cfra and mouse Y, since that's
    * what is used in time scale */
   if ((t->flag & T_OVERRIDE_CENTER) == 0) {
     t->center_global[0] = t->scene->r.cfra;