Styling the NSTextView source viewer to be a fixed-width font and to have a horizonta...

Styling the NSTextView source viewer to be a fixed-width font and to have a horizontal scroll bar

* Enblish.lproj/Debugger.nib: Adding an outlet for the NSScrollView and setting some NSTextView options
* Source/DebuggerController.m:
([DebuggerWindowController awakeFromNib]): New method to set up the scrolling system for the source viewer
([DebuggerWindowController updateSourceViewer]): Set the string to "" if there is no selected file, and make the font Monaco