Improved support for running on a real VT340 * Redesigned flag sequence page with left-to-right layout. * Fixed image rendering glitches on double-width lines. * BkSp supported as an alternative to Esc for returning to the main menu. * Ctrl+BkSp supported on the flag sequence page to reset the input. * Re-enabled the IXON flag to allow for software flow control. Thanks to @hackerb9 for help finding and fixing these issues.