[READY] Update unicode support to version 15.1 #559

Job	Run time
C++ Lint	9m 45s
Windows MSVC 17 x64 - C++ Benchmark	4m 57s
ubuntu-20.04 - C++ Benchmark	2m 55s
Windows MSVC 17 x64 - test run	32m 57s
ubuntu-20.04 - test run	25m 52s
Windows MSVC 17 x86 - test run	35m 57s
macos-12 - C++ Benchmark	3m 29s
Windows MSVC 16 x64 - test run	43m 13s
macos-12 - test run	25m 20s
ubuntu-20.04 - with Clang compiler - test run	26m 6s
ubuntu-20.04 - without libclang completer - test run	25m 3s
	3h 55m 34s

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