Replace the now non-open source PySimpleGUI with FreeSimpleGUI#160

nickygerritsen merged 1 commit intomainDOMjudge/domjudge-scripts:mainfrom

replace-pysimplegui-with-freesimpleguiDOMjudge/domjudge-scripts:replace-pysimplegui-with-freesimpleguiCopy head branch name to clipboard