[Bf-committers] Vignette node for Blender's Compositor

[Akash Hamirwasia]

Hi again!

Look if a Vignette node which I have created can be added by default in
Blender, it can be pretty helpful to everyone. Also there are no presets in
Node groups of Blender's compositor. If these presets for Blender can be
made default, then later it would be easy to add more nodes, making it
easier for more complex tasks in Blender.

Thanks,
Akash