PIObject::deleteLater important fix

PIWaitEvent::sleep() method
PITimer thread imp wait optimization, migrate to interruptable sleeps

libs/main/thread/pithread.cpp

@@ -485,7 +485,7 @@ void __PIThreadCollection::stoppedAuto() {
 	auto_mutex.lock();
 	auto_threads_.removeAll(t);
 	auto_mutex.unlock();
-	delete t;
+	t->deleteLater();
 }