The depth fetching of child nodes now works and are properly inserted into the regist...

The depth fetching of child nodes now works and are properly inserted into the register tree

* Source/DebuggerConnection.h: Changing _depthFetchElement to type id for the mysterious _NSArrayControllerTreeNode type
* Source/DebuggerConnection.m:
([DebuggerConnection propertyReceived:]): Get all the children from the property and then detach them so they can be injected into the tree
* Source/DebuggerWindowController.h: Added a _registerController outlet
* Source/DebuggerWindowController.m:
([DebuggerWindowController addChildren:toNode:]): New method that adds detached children to the specified _NSArrayControllerTreeNod using it's index set
([DebuggerWindowController outlineViewItemDidExpand:]): Change from using an NSXMLElement to the internal TreeNode
* English.lproj/Debugger.nib: Hook up the RegisterController to the outlet