Standalone: Use ansi console only if not supported

* Use ansi console for stdout and stderr only if it is not supported in the
  terminal instance provided by JLine.
* Remove usage of AnsiConsole.systemInstall().
  Since we control which print streams are provided for JLine, it is not
  necessary to install them in System, so I used System.out and System.err
  or AnsiConsole.out and AnsiConsole.err (depends on Ansi support in term).