Rename timestampMultiplier to timestampResolution

We've also decided to leave it out of the message structures since, for most uses going forward, it will not be needed.

Anyone who wants the timestamp resolution can always make the inexpensive device call to get it.

include/icsneo/communication/message/message.h

@@ -12,7 +12,6 @@ public:
 	Network network;
 	std::vector<uint8_t> data;
 	uint64_t timestamp = 0;
-	int timestampMultiplier = 0;
 	uint16_t description = 0;
 	bool transmitted = false;
 	bool error = false;