Update to Unicode 12.0.0.
* lib/gen-uni-tables.c (is_property_default_ignorable_code_point):
Exclude 0x13430..0x13438.
(get_lbp): Update such that unilbrk/lbrkprop.txt comes out as expected.
(get_wbp): Map 0xFF10..0xFF19 to WBP_NUMERIC.
* lib/uniwidth/width.c (nonspacing_table_data, nonspacing_table_ind):
Update.
(uc_width): Assign width 2 to the characters 0x16FE2..0x16FE3,
0x187F2..0x187F7, 0x1B150..0x1B152, 0x1B164..0x1B167, 0x1F6D5, 0x1F6FA,
0x1F7E0..0x1F7EB, 0x1F90D..0x1F90F, 0x1FA70..0x1FA73, 0x1FA78..0x1FA7A,
0x1FA80..0x1FA82, 0x1FA90..0x1FA95.
* tests/uniwidth/test-uc_width2.sh: Expect width 0 for the characters
0x0EBA, 0xA9BD, 0x119D4..0x119D7, 0x119DA..0x119DB, 0x119E0,
0x13430..0x13438, 0x16F4F, 0x1E130..0x1E136, 0x1E2EC..0x1E2EF. Expect
width 2 for the characters 0x16FE2..0x16FE3, 0x187F2..0x187F7,
0x1B150..0x1B152, 0x1B164..0x1B167, 0x1F6D5, 0x1F6FA, 0x1F7E0..0x1F7EB,
0x1F90D..0x1F90F, 0x1FA70..0x1FA73, 0x1FA78..0x1FA7A, 0x1FA80..0x1FA82,
0x1FA90..0x1FA95.
* All generated files under lib/uni* and tests/uni*: Regenerate.
* tests/uniname/NameAliases.txt: Update.
* tests/uniname/UnicodeData.txt: Update.
* tests/uninorm/NormalizationTest.txt: Update.
* tests/unigbrk/GraphemeBreakTest.txt: Update.
* tests/uniwbrk/WordBreakTest.txt: Update.
* All the affected modules: Bump required libunistring version.