optimized mg_addr structure

src/net.h

@@ -13,10 +13,9 @@ struct mg_dns {
 };
 
 struct mg_addr {
-  uint16_t port;    // TCP or UDP port in network byte order
-  uint32_t ip;      // IP address in network byte order
-  uint8_t ip6[16];  // IPv6 address
-  bool is_ip6;      // True when address is IPv6 address
+  uint8_t ip[16];  // Holds IPv4 or IPv6 address, in network byte order
+  uint16_t port;   // TCP or UDP port in network byte order
+  bool is_ip6;     // True when address is IPv6 address
 };
 
 struct mg_mgr {