ncurses: support the window title on XTerm-like emulators

* Many terminal emulators won't have the status-line terminfo capabilities
  but still support OSC-0 escape sequences for setting the window title.
  This affects the real XTerm, rxvt-based and many emulators that claim to be
  XTerm via $TERM (e.g. GNOME Console).
* It seems we can safely assume that any emulator with $TERM beginning with "xterm" or
  "rxvt" does in fact have OSC-0 or at least ignores it.
  The number of whitelisted emulators might be extended later on.
  This way, we don't have to add another ED flag.
* We still give precendence to the to_status_line/from_status_line capabilities
  if they are in terminfo.

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