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