Threads can't communicate with each other and call methods on each other's objects...

Threads can't communicate with each other and call methods on each other's objects, so we do have to use notifications.

* Source/SocketWrapper.h: Defining some of the notification constants
* Source/SocketWrapper.m:
([SocketWrapper _connect:]): Use the new notification system
([SocketWrapper _postNotification:withObject:]): Helper method for posting notifications
([SocketWrapper setDelegate:]): Register the delegate for these new notifications
* Source/DebuggerConnection.m:
([DebuggerConnection socketDidAccept:]): Made notification compatible