`string-replace` is easier to understand, less error-prone, much
faster, and results in shorter Lisp and byte code.  Use it where
applicable and obviously safe (erring on the conservative side).

* admin/authors.el (authors-scan-change-log):
* lisp/autoinsert.el (auto-insert-alist):
* lisp/calc/calc-prog.el (calc-edit-macro-combine-alg-ent)
(calc-edit-macro-combine-ext-command)
(calc-edit-macro-combine-var-name):
* lisp/calc/calc-units.el (math-make-unit-string):
* lisp/calendar/cal-html.el (cal-html-comment):
* lisp/calendar/cal-tex.el (cal-tex-comment):
* lisp/calendar/icalendar.el (icalendar--convert-string-for-export)
(icalendar--convert-string-for-import):
* lisp/calendar/iso8601.el (iso8601--concat-regexps)
(iso8601--full-time-match, iso8601--combined-match):
* lisp/calendar/time-date.el (format-seconds):
* lisp/calendar/todo-mode.el (todo-filter-items-filename):
* lisp/cedet/cedet-files.el (cedet-directory-name-to-file-name)
(cedet-file-name-to-directory-name):
* lisp/comint.el (comint-watch-for-password-prompt):
* lisp/dired-aux.el (dired-do-chmod):
* lisp/dired-x.el (dired-man):
* lisp/dired.el (dired-insert-directory, dired-goto-file-1):
* lisp/emacs-lisp/comp.el (comp-c-func-name):
* lisp/emacs-lisp/re-builder.el (reb-copy):
* lisp/erc/erc-dcc.el (erc-dcc-unquote-filename):
* lisp/erc/erc.el (erc-quit-reason-zippy, erc-part-reason-zippy)
(erc-update-mode-line-buffer, erc-message-english-PART):
* lisp/files.el (make-backup-file-name-1, files--transform-file-name)
(read-file-modes):
* lisp/fringe.el (fringe-mode):
* lisp/gnus/gnus-art.el (gnus-button-handle-info-url):
* lisp/gnus/gnus-group.el (gnus-group-completing-read):
* lisp/gnus/gnus-icalendar.el (gnus-icalendar-event-from-ical):
* lisp/gnus/gnus-mlspl.el (gnus-group-split-fancy):
* lisp/gnus/gnus-search.el (gnus-search-query-parse-date)
(gnus-search-transform-expression, gnus-search-run-search):
* lisp/gnus/gnus-start.el (gnus-dribble-enter):
* lisp/gnus/gnus-sum.el (gnus-summary-refer-article):
* lisp/gnus/gnus-util.el (gnus-mode-string-quote):
* lisp/gnus/message.el (message-put-addresses-in-ecomplete)
(message-parse-mailto-url, message-mailto-1):
* lisp/gnus/mml-sec.el (mml-secure-epg-sign):
* lisp/gnus/mml-smime.el (mml-smime-epg-verify):
* lisp/gnus/mml2015.el (mml2015-epg-verify):
* lisp/gnus/nnmaildir.el (nnmaildir--system-name)
(nnmaildir-request-list, nnmaildir-retrieve-groups)
(nnmaildir-request-group, nnmaildir-retrieve-headers):
* lisp/gnus/nnrss.el (nnrss-node-text):
* lisp/gnus/spam-report.el (spam-report-gmane-internal)
(spam-report-user-mail-address):
* lisp/ibuffer.el (name):
* lisp/image-dired.el (image-dired-pngnq-thumb)
(image-dired-pngcrush-thumb, image-dired-optipng-thumb)
(image-dired-create-thumb-1):
* lisp/info.el (Info-set-mode-line):
* lisp/international/mule-cmds.el (describe-language-environment):
* lisp/mail/rfc2231.el (rfc2231-parse-string):
* lisp/mail/rfc2368.el (rfc2368-parse-mailto-url):
* lisp/mail/rmail.el (rmail-insert-inbox-text)
(rmail-simplified-subject-regexp):
* lisp/mail/rmailout.el (rmail-output-body-to-file):
* lisp/mail/undigest.el (rmail-digest-rfc1153):
* lisp/man.el (Man-default-man-entry):
* lisp/mouse.el (minor-mode-menu-from-indicator):
* lisp/mpc.el (mpc--debug):
* lisp/net/browse-url.el (browse-url-mail):
* lisp/net/eww.el (eww-update-header-line-format):
* lisp/net/newst-backend.el (newsticker-save-item):
* lisp/net/rcirc.el (rcirc-sentinel):
* lisp/net/soap-client.el (soap-decode-date-time):
* lisp/nxml/rng-cmpct.el (rng-c-literal-2-re):
* lisp/nxml/xmltok.el (let*):
* lisp/obsolete/nnir.el (nnir-run-swish-e, nnir-run-hyrex)
(nnir-run-find-grep):
* lisp/play/dunnet.el (dun-doassign):
* lisp/play/handwrite.el (handwrite):
* lisp/proced.el (proced-format-args):
* lisp/profiler.el (profiler-report-header-line-format):
* lisp/progmodes/gdb-mi.el (gdb-mi-quote):
* lisp/progmodes/make-mode.el (makefile-bsdmake-rule-action-regex)
(makefile-make-font-lock-keywords):
* lisp/progmodes/prolog.el (prolog-guess-fill-prefix):
* lisp/progmodes/ruby-mode.el (ruby-toggle-string-quotes):
* lisp/progmodes/sql.el (sql-remove-tabs-filter, sql-str-literal):
* lisp/progmodes/which-func.el (which-func-current):
* lisp/replace.el (query-replace-read-from)
(occur-engine, replace-quote):
* lisp/select.el (xselect--encode-string):
* lisp/ses.el (ses-export-tab):
* lisp/subr.el (shell-quote-argument):
* lisp/term/pc-win.el (msdos-show-help):
* lisp/term/w32-win.el (w32--set-selection):
* lisp/term/xterm.el (gui-backend-set-selection):
* lisp/textmodes/picture.el (picture-tab-search):
* lisp/thumbs.el (thumbs-call-setroot-command):
* lisp/tooltip.el (tooltip-show-help-non-mode):
* lisp/transient.el (transient-format-key):
* lisp/url/url-mailto.el (url-mailto):
* lisp/vc/log-edit.el (log-edit-changelog-ours-p):
* lisp/vc/vc-bzr.el (vc-bzr-status):
* lisp/vc/vc-hg.el (vc-hg--glob-to-pcre):
* lisp/vc/vc-svn.el (vc-svn-after-dir-status):
* lisp/xdg.el (xdg-desktop-strings):
* test/lisp/electric-tests.el (defun):
* test/lisp/term-tests.el (term-simple-lines):
* test/lisp/time-stamp-tests.el (formatz-mod-del-colons):
* test/lisp/wdired-tests.el (wdired-test-bug32173-01)
(wdired-test-unfinished-edit-01):
* test/src/json-tests.el (json-parse-with-custom-null-and-false-objects):
Use `string-replace` instead of `replace-regexp-in-string`.

Newer standards like RFC 8259, which obsoletes the earlier RFC 4627,
now allow any top-level value unconditionally, so Emacs should too.

* src/json.c (Fjson_serialize, Fjson_insert): Pass JSON_ENCODE_ANY to
allow serialization of any JSON value.  Call 'lisp_to_json' instead of
'lisp_to_json_toplevel'.  Remove obsolete comments
(neither JSON_DECODE_ANY nor JSON_ALLOW_NUL are allowed here).  Reword
documentation strings.
(Fjson_parse_string, Fjson_parse_buffer): Pass JSON_DECODE_ANY to
allow deserialization of any JSON value.  Reword documentation
strings.
(lisp_to_json_nonscalar, lisp_to_json_nonscalar_1): Rename from
"toplevel" to avoid confusion.
(lisp_to_json): Adapt caller.
* test/src/json-tests.el (json-serialize/roundtrip-scalars): New unit
test.
* doc/lispref/text.texi (Parsing JSON): Update documentation.

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

* src/json.c (lisp_to_json_toplevel_1, Fjson_parse_string): Check
whether input strings are actually strings.

* test/src/json-tests.el (json-parse-string/wrong-type)
(json-serialize/wrong-hash-key-type): New regression tests.

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

* test/src/json-tests.el (json-serialize/object):
Accept failure with different code.

* test/src/json-tests.el (json-parse-string/null): Make JSON object
syntactically valid.  This test is supposed to check whether an
escaped null character causes an error, but without quoting the string
it would be syntactically invalid in any case.

* src/json.c (enum json_array_type): New type.
(struct json_configuration): New field array_type.
(json_parse_args): Rename the last argument.  Handle the
:array-type keyword argument (bug#32793).
(Fjson_parse_string): Update the docstring accordingly.
(json_to_lisp): Handle the case of :array-type being `list'.  Add
a call to 'rarely_quit' inside the loop.
(syms_of_json): Define new symbols.
(Fjson_serialize, Fjson_insert, Fjson_parse_string)
(Fjson_parse_buffer): Update the config struct initializers.

Update some other copyright years automatically, by running:
Run 'UPDATE_COPYRIGHT_YEAR=2019 \
UPDATE_COPYRIGHT_USE_INTERVALS=1 \
UPDATE_COPYRIGHT_MAX_LINE_LENGTH=79 admin/update-copyright'
followed by 'admin/merge-gnulib'.