Support matchmaking with common code to the 360

Games for Windows Live provides a set of functions for Windows that are nearly identical to the lobby functions for the 360. In fact, with a few minor changes enabled by the GFWL define, RakNet uses the same code on both platforms.

Everything is identical to xbox360lobby.html, with the following changes:

1. Call XLiveInitialize before Client_Login
2. Add this code:
   // Use PeekMessage() so we can use idle time to render the scene.
   if( PeekMessage( &msg, NULL, 0U, 0U, PM_REMOVE ) != 0 ) {
   if( FALSE == XLivePreTranslateMessage( &msg ) ) {
   // continue processing the message as XLivePreTranslateMessage
   // did not consume it.
   TranslateMessage( &msg );
   DispatchMessage( &msg );
   }
   }
3. Call XLiveUnInitialize after shutdown
4. Define GFWL in your preprocessor settings

Index
XBOX 360 Lobby
PluginInterface