bug#58506: Use ".dir-locals.eld" and ".dir-locals-2.eld" when they exist

[Robert Pluim]

>>>>> On Fri, 14 Oct 2022 13:25:22 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> So if we introduce .dir-locals.eld, we should take the opportunity to
    Lars> add a brand new, sensible, extensible syntax, too.

We could use an almost syntax-less language with lots of structuring
parentheses (LOSP for short). And weʼd have to call the file
'please-pwn-my-Emacs.el'

Seriously, having files popping up safe-variable warnings is scary
enough already, do we really need to complicate things by adding
yet-another not-quite-lisp syntax? Is the support for `eval' in
.dir-locals.el not enough?

Robert
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