bug#71157: 30.0.50; Unbundle Idlwave from Emacs?

[JD Smith]

> On May 23, 2024, at 8:21 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
> 
> AFAICT this is a package with a very small audience, so I suggest we
> unbundle it from Emacs, leaving it up to users to install it from GNU
> ELPA instead.
> 
> Maybe we could move it to `lisp/obsolete` for Emacs-30?

I support this plan.   Thanks for your help merging ~10yrs of diverged commits. 
 The version on ELPA is functional with recent versions of IDL.