Support Unicode 13.0

Support Unicode 13.0

* admin/unidata/BidiBrackets.txt:
* admin/unidata/BidiMirroring.txt:
* admin/unidata/Blocks.txt:
* admin/unidata/NormalizationTest.txt:
* admin/unidata/SpecialCasing.txt:
* admin/unidata/UnicodeData.txt:
* admin/unidata/copyright.html:
* test/manual/BidiCharacterTest.txt: Updated files imported from
Unicode v13.0.

* admin/unidata/blocks.awk: Add "Symbols for Legacy Computing" to
known aliases.

* lisp/international/fontset.el (script-representative-chars)
(setup-default-fontset): Add new scripts.
* lisp/international/characters.el: Set syntax for Symbols for
Legacy Computing characters.  Update setting of char-width-table.
* lisp/international/mule-cmds.el (ucs-names): Update ranges of
characters for which we want names in 'ucs-names'.

* test/lisp/international/ucs-normalize-tests.el
(ucs-normalize-tests--failing-lines-part1)
(ucs-normalize-tests--failing-lines-part2): Update according to
'ucs-normalize-check-failing-lines'.