improve handling of interrupts, copy and paste shortcuts * QTerminal.h (QTerminal::report_status_message): New signal. (QTerminal::QTerminal): Set shortcuts for copy and paste actions. Add copy and paste actions to QTerminal widget. Connect settings_changed, report_status_message, copyClipboard_signal, and pasteClipboard_signal. * QWinTerminalImpl.cpp (QWinTerminalImpl::copyClipboard): If selection is set, copy it and report status message. Otherwise, interrupt. * TerminalView.cpp (TerminalView::copyClipboard): Likewise. * main-window.cc (main_menu::construct_file_menu): Don't set shortcut for open action. (main_window::construct_edit_menu): Delete unimplemented cut, select all, and delete actions. Connect copy and paste actions to signals. (main_window::copyClipboard_signal, main_window::pasteClipboard_signal): New signals. (main_window::copyClipboard, main_window::pasteClipboard): New slots. (main_window::_cut_action): Delete member variable. * octave-qt-link.cc (octave_qt_link::do_pre_input_event): Disable input processing by the windows console. (octave_qt_link::do_post_input_event): Enable input processing by the windows console. * terminal-dock-widget.h, terminal-dock-widget.cc: Delete notice_settings, copyClipboard, and pasteClipboard signals, slots, and connections. (terminal_dock_widget::terminal_dock_widget): Don't connect visibilityChanged signal.

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