[IZPACK-1059] - AntActionInstallerListener - use graphical InputHandler instead of Ant's DefaultInputHandler in GUI environments

For AntActionInstallerListener/AntActionUninstallerListener there is currently used org.apache.tools.ant.input.DefaultInputHandler as input handler if the \<input\> Ant command is used. The default input handler offers just a simple prompt on the command line.

Use a graphical input handler which pops up a dialog, or fall back to DefaultInputHandler on headless devices automatically.