• add Unix sockets support on Windows e40f070
• add Linux abstract socket support e40f070 (sadly not working on windows, in spite of MS claiming it does)
• make C++17 default for VS2022 projects VS170 binary names mismatch on ARM #4207 (needed to detect if <afunix.h> header is present)
• use localhost socket in PollSet on windows when available (mentioned in SocketReactor while(1) CPU wasted #3773 )

#2770