[iPlug] define min max on a portable fashion and take that opportunity to create a new portab header file instead of always duplicating the macros and other api portability definitions.
Ideally, this should have been implented in WDL once for all, and all string specifics wuld have lied there.
[IplugStandalone] fixed preferences app dialog crash when previously installed asio was not found,now automatically restorig previous config instead of crashing