gui: provide defaults for all values read from the settings file * files-dockwidget.cc(notice_settings): provide default values for settings * file-editor-tab.cc(update_lexer,notice_settings): default font is Courier New instead of Courier * main-window.cc(notice_settings): provide defaults for terminal font and cursor * main-window.cc(construct): new default window geometry and widget placement * resource-manager.cc(do_update_network_settings): default for port setting * settings-dialog.cc(constructor): provide default values for settings

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