version 4.5.0

PIThread::stopAndWait now returns bool
PIKbdListener on Linux now use piwaitevent_p and can immediately stop
new base method piZeroMemory, also migrate all "memset 0" to piZeroMemory

libs/main/thread/piconditionvar.cpp

@@ -58,7 +58,7 @@ PIConditionVariable::PIConditionVariable() {
 #  if !defined(MAC_OS)
 	pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
 #  endif
-	memset(&(PRIVATE->nativeHandle), 0, sizeof(PRIVATE->nativeHandle));
+	piZeroMemory(PRIVATE->nativeHandle);
 	pthread_cond_init(&PRIVATE->nativeHandle, &condattr);
 #endif
 }