Synthesize new properties for class cross-referencing and SocketWrapper now init...

Synthesize new properties for class cross-referencing and SocketWrapper now init's with a DebuggerConnection

* Source/DebuggerConnection.h: New property for the DebuggerWindowController
* Source/DebuggerConnection.m: Synthesize new property and changed SocketWrapper's initializer
* Source/DebuggerWindowController.h: New property for DebuggerConnection
* Source/DebuggerWindowController.m: ditto
* Source/SocketWrapper.h: The init method now takes a DebuggerConnection (and stores it) instead of a port
* Source/SocketWrapper.m: ditto