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ICU-20062 Set the Python -B flag to inhibit the writing of .pyc files.
ICU-23343 fix & adjust C++ Unicode tools
ICU-8966 ICU-12850 add API/data/code for text layout properties InPC, InSC, vo (#92)
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 NULL with nullptr in all C++ code.
ICU-22503 add property Indic_Conjunct_Break
ICU-22785 move cptrie bit setter to toolutil; add getCPTrieSize()
ICU-21652 add emoji properties of strings - 7 new properties: API constants & property names - u_stringHasBinaryProperty(s, property) & UCharacter.hasBinaryProperty(s, property) - two additional source data files - new genprops part for writing new binary data file uemoji.icu - data for existing emoji properties moved from uprops.icu (hardcoded in C++) to uemoji.icu (always loaded) - new EmojiProps implementation
ICU-7611 move genprops from icu tree to tools tree
ICU-21833 Replace U_OVERRIDE with override everywhere.
ICU-23343 preparseucd.py, API constants, script metadata
ICU-21833 Replace UChar with char16_t in all C++ code.