Rearranged the server-side object hierarchy (read more)

This has been a long-running problem for days, but I've finally
implemented a correctly working hierarchy between the ClientData,
AccountData and CharacterData objects:

CharacterData -> AccountData -> ClientData

There doesn't seem to be any issues with it right now, touch wood.

server/account_data.hpp

@@ -31,7 +31,6 @@ struct AccountData {
 	bool whiteListed = true;
 
 	int clientIndex;
-	int characterIndex;
 };
 
 #endif