Add IP and Mac user defined literals. (#1999)

* Added mac and ip literals for quick creation.

* Fixed the static MacValues to be const.

Author: Dimi1010

Common++/header/IpAddress.h

@@ -883,6 +883,19 @@ namespace pcpp
 		std::unique_ptr<IPv6Network> m_IPv6Network;
 	};
 
+	namespace literals
+	{
+		inline IPv4Address operator""_ipv4(const char* addrString, std::size_t size)
+		{
+			return IPv4Address(std::string(addrString, size));
+		}
+
+		inline IPv6Address operator""_ipv6(const char* addrString, std::size_t size)
+		{
+			return IPv6Address(std::string(addrString, size));
+		}
+	}  // namespace literals
+
 	inline std::ostream& operator<<(std::ostream& oss, const pcpp::IPv4Address& ipv4Address)
 	{
 		oss << ipv4Address.toString();

Common++/header/MacAddress.h

@@ -177,14 +177,22 @@ namespace pcpp
 		bool copyToNewBuffer(uint8_t** buffer, size_t& size) const;
 
 		/// A static value representing a zero value of MAC address, meaning address of value "00:00:00:00:00:00"
-		static MacAddress Zero;
+		static const MacAddress Zero;
 		/// A static value representing a broadcast MAC address, meaning address of value "ff:ff:ff:ff:ff:ff"
-		static MacAddress Broadcast;
+		static const MacAddress Broadcast;
 
 	private:
 		std::array<uint8_t, 6> m_Address{};
 	};
 
+	namespace literals
+	{
+		inline MacAddress operator""_mac(const char* addrString, size_t size)
+		{
+			return MacAddress(std::string(addrString, size));
+		}
+	}  // namespace literals
+
 	inline std::ostream& operator<<(std::ostream& oss, const pcpp::MacAddress& macAddress)
 	{
 		oss << macAddress.toString();

Common++/src/MacAddress.cpp

@@ -3,9 +3,9 @@
 namespace pcpp
 {
 
-	MacAddress MacAddress::Zero(0, 0, 0, 0, 0, 0);
+	const MacAddress MacAddress::Zero(0, 0, 0, 0, 0, 0);
 
-	MacAddress MacAddress::Broadcast(0xff, 0xff, 0xff, 0xff, 0xff, 0xff);
+	const MacAddress MacAddress::Broadcast(0xff, 0xff, 0xff, 0xff, 0xff, 0xff);
 
 	std::string MacAddress::toString() const
 	{