add create script context menu to history window * history-dockwidget.h (history_doc_widget::command_create_script): New signal. * history-dockwidget.cc, history-dockwidget.h (history_dock_widget::ctxMenu): New menu item, Create script. (history_dock_widget::handle_contextmenu_create_script): New function. * file-editor-interface.h (file-editor-interface::request_new_file): New argument, commands. * file-editor-tab.h, file-editor-tab.cc (file_editor_tab::new_file): New argument, commands. * m-editor/file-editor.h, m-editor/file-editor.cc (file_editor::new_file, file_editor::request_new_file): New argument, commands. * main-window.h, main-window.cc (main_window::new_file): New argument, commands. main_window::construct): Connect history_window::command_create_script signal to main_window::new_file.