Use UTF-8 for most files with non-ASCII characters.

Use UTF-8 for most files with non-ASCII characters.

* admin/notes/unicode (etc/tutorials/TUTORIAL.ko, leim/quail/hanja.el)
(leim/quail/hanja3.el, leim/quail/symbol-ksc.el):
Now utf-8, not iso-2022-7bit.  Also, files that contain non-UTF-8
characters are now encoded in utf-8-emacs, not iso-2022-7bit.
* etc/tutorials/TUTORIAL.ko, tutorials/TUTORIAL.th:
Switch from iso-2022-7bit to utf-8.
* leim/quail/cyrillic.el, leim/quail/czech.el, leim/quail/ethiopic.el:
* leim/quail/greek.el, leim/quail/hanja.el, leim/quail/hanja3.el:
* leim/quail/hebrew.el, leim/quail/lao.el, leim/quail/lrt.el:
* leim/quail/slovak.el, leim/quail/symbol-ksc.el, leim/quail/thai.el:
* leim/quail/tibetan.el, leim/quail/viqr.el, leim/quail/vntelex.el:
* leim/quail/vnvni.el, leim/quail/welsh.el:
* lisp/international/latin1-disp.el, lisp/international/mule-util.el:
* lisp/language/cyril-util.el, lisp/language/european.el:
* lisp/language/ind-util.el, lisp/language/lao-util.el, lisp/language/thai.el:
* lisp/language/tibet-util.el, lisp/language/tibetan.el:
* lisp/language/viet-util.el:
Switch from iso-2022-7bit to utf-8 or (if needed) utf-8-emacs.

Fixes: debbugs:13936