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ICU-10879 Split out OBJECTS from Makefiles into separate files
ICU-23201 Annotate C code with U_FALLTHROUGH.
ICU-22767 Fix GCC warning and turn warning to errors
ICU-12764 UTF-8 source files, update file encoding comments.
ICU-13436 Fix various typos and spelling mistakes.
ICU-22936 Replace all ICU4C code that uses UBool as an integer.
ICU-13030 Fix one more location using U_CALLCONV.
ICU-23151 Fixed pkgdata crash with Clang-CL
ICU-11826 makeconv main() use CharString for outFileName; change from .c to .cpp; CharString add lastIndexOf(char) and ensureEndsWithFileSeparator()
ICU-21148 Consistently use standard lowercase true/false everywhere.