While reviewing uses of `last-kbd-macro` for more problems like
those of bug#61700 I noticed that we don't need the `kmacro-register`
type any more (we can directly use the new `kmacro` type instead).
Also `macros.el` requires `kmacro` so rather than autoload
`macro--string-to-vector` it's simpler to move the function to
`kmacro.el`.  And while at it fold into it the `stringp` test that's used
before every call to that function.

* lisp/kmacro.el (kmacro--to-vector): Rename from
`macro--string-to-vector`, move from `mcros.el`, and make it work for
vectors.
(kmacro-ring-head, kmacro-lambda-form): Simplify accordingly.
(cl-print-object): Remove unused declaration.
(kmacro-register): Delete type.  Use `kmacro` objects instead.
(register-val-jump-to, register-val-describe, register-val-insert):
Rewrite accordingly.
(kmacro-to-register): Put the `kmacro` object.

* lisp/macros.el (macro--string-to-vector): Move to `kmacro.el`.
(insert-kbd-macro): Use `kmacro--to-vector`.

* src/macros.c (end_kbd_macro): Always generate a vector.

Merge the old lambda+list into a single OClosure object which plays
both roles at the same time.  Take advantage of it to provide a
`cl-print-object` method so kmacro objects print nicely using the
`key-parse` syntax.
Also replace the old `kmacro-lambda-form` with a new `kmacro` constructor
which takes a `key-parse` syntax, so that the code inserted with
`insert-kbd-macro` is now more readable.

* lisp/kmacro.el (kmacro): New OClosure type.
(kmacro-ring-head): Use `kmacro` constructor.
(kmacro-push-ring): Convert `elt` from old representation if needed.
(kmacro-split-ring-element, kmacro-view-ring-2nd, kmacro-view-macro):
Adapt to new representation.
(kmacro-exec-ring-item): Turn into obsolete alias.
(kmacro-call-ring-2nd, kmacro-end-or-call-macro): Adjust accordingly.
(kmacro-start-macro): Simplify call to `kmacro-push-ring`.
(kmacro): New constructor function.  Replaces `kmacro-lambda-form`.
(kmacro-lambda-form): Use it and declare obsolete.
(kmacro-extract-lambda): Rewrite and declare obsolete.
(kmacro-p): Rewrite.
(cl-print-object): New method.
(kmacro-bind-to-key, kmacro-name-last-macro): Simplify.

* lisp/macros.el (macro--string-to-vector): New function.
(insert-kbd-macro): Use it.  Generate code using the `kmacro` constructor.

* test/lisp/kmacro-tests.el (kmacro-tests-kmacro-bind-to-single-key):
Silence warning.
(kmacro-tests-name-last-macro-bind-and-rebind): Strengthen the test a bit.
(kmacro-tests--cl-print): New test.

* lisp/macros.el (insert-kbd-macro): Don't give bogus output on
names that have no function definition (bug#30309).

Run "TZ=UTC0 admin/update-copyright".

Run "TZ=UTC0 admin/update-copyright $(git ls-files)".

* lisp/macros.el (macros--insert-vector-macro): Pass all elements to
'prin1-char', not just those that satisfy characterp (because characters
which have modifier bits set wouldn't qualify otherwise).
'prin1-char' will return nil if it can't handle the argument (e.g.,
for symbols representing function keys).