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ICU-23055 Update outdated site.icu-project.org URLs.
ICU-22596 IBM-1388 converter data update
ICU-12564 Update copyright notice in trunk
ICU-22714 fix zos build, use OpenXL
ICU-12953 Include GSM 03.38 mapping in ICU by default
ICU-22007 remove outdated terms of use from Unicode conversion files
ICU-22357 Rename gb18030.ucm to add -2022, follow-on to PR #2430