created the package "edu.illinois.codingtracker.operations.focus" and
add class DetectFocusGainsWorkbench(), DetectFocusLooseWorkbench() and
add in package "edu.illinois.codingtracker.listeners" the method ListenerFocus() and finally add in class OperationRecorder() this is the package "package edu.illinois.codingtracker.recording"

It relates to issue karlitrotski/CodingSpectator/#17.
Detect when the development environment gains focus,loose focus when user uses another application.
programmed by @tchambil.