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ICU-23151 Fixed pkgdata crash with Clang-CL
ICU-23254 Remove C++ static initialization
ICU-23038 update collation unsafe-backward set
ICU-23343 fix & adjust C++ Unicode tools
ICU-23247 Delete use of umachine.h & urename.h internal header files.
ICU-23056 Fixed genren.pl to include the correct header-guard changes and reverted my earlier fix for urename.h.
ICU-23247 Update doc and code about generated .java code formatting
ICU-23201 Annotate C code with U_FALLTHROUGH.
ICU-12734 Adjust ICUMemCheck.pl for deletion of the Layout Engine.
ICU-23090 Remove ICU-specific patch to vendored JSON parser
ICU-21545 Add plumbing for running icuexportdata in BRS