version 4.1.0

maybe fix hang on PIEthernet::interrupt()
replace piLetobe with piChangeEndian:
 * piChangeEndianBinary
 * piChangeBinary
 * piChangedBinary
PIDiagnostics::start now accept PISystemTime instead of number
add PITimer::start(PISystemTime, std::function<void()>) overload

libs/main/core/piwaitevent_p.cpp

@@ -51,6 +51,7 @@ void PIWaitEvent::create() {
 		piCout << "Error with pipe:" << errorString();
 	} else {
 		fcntl(pipe_fd[ReadEnd], F_SETFL, O_NONBLOCK);
+		fcntl(pipe_fd[WriteEnd], F_SETFL, O_NONBLOCK);
 	}
 #endif
 }