apply some code analyzer recommendations
ICU flag now check if libicu exists
prepare for more accurate growth of containers (limited PoT, then constantly increase size)
in almost all methods removed timeouts in milliseconds, replaced to PISystemTime
PITimer rewrite, remove internal impl, now only thread implementation, API similar to PIThread
PITimer API no longer pass void*
PIPeer, PIConnection improved stability on reinit and exit
PISystemTime new methods
pisd now exit without hanging
pipacketextractor Header mode now more flexible
fix splitTime mode
more refactoring
add virtual override to functions
remove piforeach
replace 0 to nullptr
iterate over pimap via iterators
replace CONNECTU to CONNECT# with compile time check
