Latest work on network play branch

[thelusiv]

More screenshots:http://vdrift.net/gallery/Development-sh...play_test9So basic multiplayer is working now. Features include:* display of transmission and receive rates* display of sync time (latency)* networking info disappears on disconnect* cars can drive around trackBut still there is much to do:* only two cars at a time* no collision detection between cars* disconnect could be more graceful (client car doesn't disappear, client car's sound continues)