Update grapheme cluster boundary detection to Unicode 17 - #214
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Rewrite the grapheme cluster boundary implementation to conform to Unicode TR29 with all current rules (GB3-GB9c, GB11, GB12/GB13). Property data is now generated from Unicode data files using a Python script (scripts/gen-grapheme-data.py) and packed into compact lookup tables using packTab, instead of being hard-coded. Add a conformance test using Unicode's GraphemeBreakTest.txt.
If new versions of Unicode add new properties, the script should fail instead of silently ignoring them.
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