add arm64 architecture
add SCons 4.5 compatibility and use instruction sets through SSE4.2 by default
rm IA-64 and 32-bit x86 build support, making amd64/x86-64 default
reformat Python files with black
update explanatory comment regarding LM_GETIDEALSIZE
rename SECURE_CLIENT_PROTOCOL_TEST to SECURE_CLIENT_PROTOCOL
Update zlib to version 1.3.1
Fix win32 pot generation [L#2045404]