Prepare to send reason for leaving a game. New protocol version as it is not compatible to the current beta.

src/net/common/netpacket.cpp

@@ -309,6 +309,8 @@ struct GCC_PACKED NetPacketPlayerLeftData
 {
 	NetPacketHeader		head;
 	u_int32_t			playerId;
+	u_int16_t			leaveReason;
+	u_int16_t			reserved;
 };
 
 struct GCC_PACKED NetPacketGameAdminChangedData

src/net/netpacket.h

@@ -30,7 +30,7 @@
 #include <vector>
 #include <list>
 
-#define NET_VERSION_MAJOR			2
+#define NET_VERSION_MAJOR			3
 #define NET_VERSION_MINOR			0
 
 #define MIN_PACKET_SIZE				4