Replaced a lot of terminal interaction with events: Clearing, loading and saving workspace, running a file. Default location for saving a new file is now the current working directory. Fixed bad settings with a fresh installation of the GUI by providing a file with default settings and installing it when appropriate. * default-settings: New file containing the default settings. * file-editor-tab: Subclassed event observer and added code to send a run event. * main-window: Sending workspace events instead of using the terminal. * octave-event: Added new event types. * octave-link: Added getter for the current working directory. * octave-gui: Adjusted code, so the default settings can be loaded. * resource-manager: Added code to handle the logic with a default settings file.