SwingCopyJob's background worker thread (provided via an extended SwingW...

SwingCopyJob's background worker thread (provided via an extended SwingWorker) now only handles updating of the EDT. It delegates the actual job of copying folders and files to a custom Runnable (CopyJobWorkDelegate class) that is run on its own thread. No perceivable decrease in performance. Next step is to have the CopyJobWorkDelegate manage a ThreadPoolExecutor that oversees a number of threads, one per file to be copied up to some limit, for greater concurrency and to improve performance. Also modified the project's root gitignore file to prevent exclusion of the html DiffReport template and modified the GUI's ScreenSwitcher class to ensure ongoing copy jobs are cancelled prior to exit.