Partial rewrite of server_application.cpp

I've also fixed some other issues along the way. However, the next step
requires support for multiple rooms. Finally.

common/network/packet/serial_packet_base.hpp

@@ -30,6 +30,7 @@
 
 #include "SDL/SDL_net.h"
 
+#define NETWORK_VERSION 20140607
 #define PACKET_STRING_SIZE 100
 
 struct SerialPacketBase {
@@ -39,7 +40,7 @@ struct SerialPacketBase {
 
 	typedef SerialPacketType Type;
 
-	virtual ~SerialPacketBase();
+	virtual ~SerialPacketBase() {};
 };
 
 typedef SerialPacketBase SerialPacket;