Option to not fiddle with rainbow-delimiter-mode

[skrat]

I think it would be for the best if we could, instead of having an extension that does one thing that might not be what everyone wants (I for instance don't want to use rainbow-delimiter-mode at all, but I do want to use parinfer in both modes), use hooks for this and let the user configure the behavior.

[DogLooksGood]

Hi, there's a plan to remove these opinioned stuff in the next version, which provide a pure parinfer smart mode.