Finish the refactoring in the previous commit and now the window title is properly set

Finish the refactoring in the previous commit and now the window title is properly set

* Source/DebuggerConnection.h: Removed the definition for -[windowDidClose]
* Source/DebuggerConnection.m:
([DebuggerConnection initWithWindowController:port:session:]): Don't set the status in this method because the nib isn't awake yet
* Source/DebuggerWindowController.m:
([DebuggerWindowController initWithPort:session:]): Make self key and front
([DebuggerWindowController awakeFromNib]): Set the default status to be "Connecting"
([DebuggerWindowController windowWillClose:]): Removed