Correctly cleanup ENet packets if not used

This additionally adds logging when bad MAC addresses are found when transferring packets between clients

src/network/room.h

@@ -45,6 +45,9 @@ constexpr MacAddress NoPreferredMac = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
 // 802.11 broadcast MAC address
 constexpr MacAddress BroadcastMac = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
 
+/// Converts a MAC address to a string representation.
+std::string MacAddressToString(const MacAddress& address);
+
 // The different types of messages that can be sent. The first byte of each packet defines the type
 enum RoomMessageTypes : u8 {
     IdJoinRequest = 1,