* lisp/kmacro.el: Use OClosure instead of messing with internals

* lisp/kmacro.el: Use OClosure instead of messing with internals

* test/lisp/progmodes/elisp-mode-tests.el
(xref-elisp-generic-co-located-default): Silence warnings.

* test/lisp/kmacro-tests.el (kmacro-tests--cl-print): New test.

* lisp/kmacro.el (kmacro-function): New OClosure type.
(kmacro-lambda-form): Use it.
(kmacro-extract-lambda, kmacro-p): Simplify/rewrite accordingly.
(cl-print-object): New method.

* lisp/emacs-lisp/oclosure.el (oclosure-make): Keep interactive specs before the
function's code.

* lisp/edmacro.el (edmacro-finish-edit): Prefer `kmacro-p`.