Use automatic validation of UI items for the toolbar buttons, rather than manually...

Use automatic validation of UI items for the toolbar buttons, rather than manually enabling/disabling them

* Source/DebuggerController.h: Remove the outlets for the toolbar items
* Source/DebuggerController.m:
(validateUserInterfaceItem:): Validate the reconnect button
(setStatus:): Remove the block of code that sets button states
(updateStackViewer): ditto
* English.lproj/Debugger.xib: Remove the outlets and set all the toolbar items to autovalidate