Update to Unicode 15.1.0

[Bruno Haible]

This patch updates Gnulib to Unicode 15.1.0.

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2024-01-30  Bruno Haible  <bruno@clisp.org>

        Update to Unicode 15.1.0.

        * lib/gen-uni-tables.c (PROP_SENTENCE_TERMINAL): Renamed from
        PROP_STERM.
        (PROP_IDS_UNARY_OPERATOR, PROP_ID_COMPAT_MATH_CONTINUE,
        PROP_ID_COMPAT_MATH_START): New enum items.
        (UC_INDIC_CONJUNCT_BREAK_*): New enum items.
        (unicode_indic_conjunct_break): New variable.
        (fill_properties): Rename local variable propvalue to propcode. Handle
        the properties IDS_Unary_Operator, ID_Compat_Math_Continue,
        ID_Compat_Math_Start. Parse the InCB values from file
        DerivedCoreProperties.txt.
        (indic_conjunct_break_as_c_identifier,
        output_indic_conjunct_break_test): New functions.
        (indic_conjunct_break_table): New variable.
        (output_indic_conjunct_break): New function.
        (fill_width): Accept spaces at the end of field0 and at the start and
        end of field1.
        (LBP_QU1, LBP_QU2, LBP_QU3): New enum items, for Unicode TR #14 rules
        (LB15a) and (LB15b).
        (LBP_AP, LBP_AK, LBP_AS, LBP_VI, LBP_VF): New enum items, for Brahmic
        scripts.
        (get_lbp): Update such that unilbrk/lbrkprop.txt comes out as expected.
        (debug_output_lbp): Print either LBP_QU1 or LBP_QU2 or LBP_QU3 as
        LBP_QU. Handle LBP_AP, LBP_AK, LBP_AS, LBP_VI, LBP_VF.
        (fill_org_lbp): Accept spaces at the end of field0 and at the start and
        end of field1. Recognize LBP_AP, LBP_AK, LBP_AS, LBP_VI, LBP_VF.
        (debug_output_org_lbp): Handle LBP_AP, LBP_AK, LBP_AS, LBP_VI, LBP_VF.
        (lbp_value_to_string): Handle LBP_QU1, LBP_QU2, LBP_QU3 instead of
        LBP_QU. Handle LBP_AP, LBP_AK, LBP_AS, LBP_VI, LBP_VF.
        (output_lbrk_rules_as_tables): Treat LBP_QU as macro that maps to three
        table rows/columns. Replace rule (LB15) with rules (LB15b) and (LB15a).
        (get_wbp): Update such that uniwbrk/wbrkprop.txt comes out as expected.
        (main): Invoke output_indic_conjunct_break_test and
        output_indic_conjunct_break.

        * 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.

        * lib/unilbrk/lbrktables.h (LBP_QU1, LBP_QU2, LBP_QU3): New enum items,
        for Unicode TR #14 rules (LB15a) and (LB15b).
        (LBP_QU): Remove enum item.
        (LBP_AP, LBP_AK, LBP_AS, LBP_VI, LBP_VF): New enum items, for Brahmic
        scripts.
        (unilbrk_table): Update array bounds.
        * lib/unilbrk/u8-possible-linebreaks.c (u8_possible_linebreaks_loop):
        Conditionally replace LBP_QU2 with LBP_QU1, for rule (LB15a).
        Conditionally replace LBP_QU3 with LBP_QU1, for rule (LB15b).
        * lib/unilbrk/u16-possible-linebreaks.c (u16_possible_linebreaks_loop):
        Likewise.
        * lib/unilbrk/u32-possible-linebreaks.c (u32_possible_linebreaks_loop):
        Likewise.

        * lib/unictype.in.h (UC_INDIC_CONJUNCT_BREAK_*): New enum values.
        (uc_indic_conjunct_break_name, uc_indic_conjunct_break_byname,
        uc_indic_conjunct_break): New declarations.
        * lib/unictype/incb_byname.c: New file.
        * lib/unictype/incb_byname.gperf: New file.
        * lib/unictype/incb_name.c: New file.
        * lib/unictype/incb_name.h: New file.
        * lib/unictype/incb_of.c: New file.
        * lib/unictype/incb_of.h: New generated file.
        * modules/unictype/incb-all: New file.
        * modules/unictype/incb-byname: New file.
        * modules/unictype/incb-name: New file.
        * modules/unictype/incb-of: New file.
        * tests/unictype/test-incb_byname.c: New file.
        * tests/unictype/test-incb_name.c: New file.
        * tests/unictype/test-incb_of.c: New file.
        * tests/unictype/test-incb_of.h: New generated file.
        * modules/unictype/incb-byname-tests: New file.
        * modules/unictype/incb-name-tests: New file.
        * modules/unictype/incb-of-tests: New file.

        * lib/unigbrk.in.h (uc_is_grapheme_break, u*_grapheme_next,
        u*_grapheme_prev): Add comments.
        * lib/unigbrk/u-grapheme-breaks.h (FUNC): Add local variables
        incb_consonant_extended, incb_consonant_extended_linker,
        incb_consonant_extended_linker_extended. Implement rule (GB9c).
        * modules/unigbrk/u8-grapheme-breaks (Depends-on): Add unictype/incb-of.
        * modules/unigbrk/u16-grapheme-breaks (Depends-on): Likewise.
        * modules/unigbrk/u32-grapheme-breaks (Depends-on): Likewise.
        * modules/unigbrk/uc-grapheme-breaks (Depends-on): Likewise.
        * tests/unigbrk/test-uc-is-grapheme-break.c (main): Add local variables
        incb_consonant_extended, incb_consonant_extended_linker,
        incb_consonant_extended_linker_extended. Skip test cases that match rule
        (GB9c).
        * modules/unigbrk/uc-is-grapheme-break-tests (Depends-on): Add
        unictype/incb-of.

        * All the affected modules: Bump required libunistring version.