Register and Login in DataSessions
Changed failure UNDEFINED.
Added signals and slots for UserConnection.:
Moved templated class definitions to header files. Added contains method in SharedSet.
TradingServer now subclasses QThread. I've added logic for receiveing new user and basic signals and slots for handling connections.
Added prototype implementation for handling login and passing user connection. I am having real problems with moving socket to different thread.
I've added logic for passing user connection from login server to trading server. Balancing code was simplified.
Because MasterServer is now a subclass QThread, spawning it had to be slightly changed.