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ICU-21796 Rename bazel build files from BUILD to BUILD.bazel. This can prevent conflicts when ICU users have their own BUILD files already.
ICU-13358 Fixed cpyscan problems. Enhanced cpyscan.pl to use online version of cpyskip.txt by default. Added the new Unicode copyright comment in many tools files.
ICU-21833 Replace UChar with char16_t in all C++ code.
ICU-22028 Export collation and normalization data for ICU4X
ICU-20062 Set the Python -B flag to inhibit the writing of .pyc files.
ICU-9101 copy icu/branches/markus/collv2/source/tools/genuca2/genuca2.cpp to tools/trunk/unicode/c/genuca/genuca.cpp