Remove network connection from local games

This removes need for TCP network connection in single-player games.

Instead, game will now create internal pseudo-connection that performs
client<->server communication by posting sent messages to client/server
asio::io_service'a.

This should fix gameplay aborting on switching to another app on iOS (and
apparently, on Android in some cases)

server/CVCMIServer.cpp

@@ -1077,3 +1077,8 @@ INetworkHandler & CVCMIServer::getNetworkHandler()
 {
 	return *networkHandler;
 }
+
+INetworkServer & CVCMIServer::getNetworkServer()
+{
+	return *networkServer;
+}