add Python Tutor
updated pythonTutor panel to allow scrolling...
fixed rendering issue (gap between stack & heap adjusted disproportionately when stack width grew) | Some sundry formating
calculated co-ordinates of pointers (need to test next)
changed toggle behaviour (PythonTutor & DebugInfo)
updated visualizer: calculate layout & onDeployCompleted | added visualizer.DebugInfo