Investigate multiplayer memory layout some more

[squeek502]

After #3, certain functions in D2Reader will not work while in a multiplayer game, like reading the current area, getting /players X (should be determined by the number of players in the multiplayer game), etc. This is because getWorldPointer and/or getGamePointer don't work while on a multiplayer server.

This is no real problem for now, since none of the core functionality relies on this data being available, but for the future it'd be good to get these things to work on multiplayer servers.