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/text/pistring.cpp

@@ -178,7 +178,7 @@ T toDecimal(const PIString & s) {
 
 #define pisprintf(f, v)      \
 	char ch[256];            \
-	memset(ch, 0, 256);      \
+	piZeroMemory(ch, 256);   \
 	snprintf(ch, 256, f, v); \
 	return PIStringAscii(ch);