More tuning

- replaced POD new/delete with malloc/free
- some more SEGLEN <= 1
- some gnu::pure
- more const attributes
- some static attributes

wled00/udp.cpp

@@ -206,7 +206,7 @@ void notify(byte callMode, bool followUp)
   notificationCount = followUp ? notificationCount + 1 : 0;
 }
 
-void parseNotifyPacket(const uint8_t *udpIn) {
+static void parseNotifyPacket(const uint8_t *udpIn) {
   //ignore notification if received within a second after sending a notification ourselves
   if (millis() - notificationSentTime < 1000) return;
   if (udpIn[1] > 199) return; //do not receive custom versions