When in console mode, some messages from CLI interaction still resulted
in popup dialogs, e.g. the response from `--help` or `--version`. This
is becasue those information are communicated via exceptions and those
exceptions prevented the console mode from being properly set.
By using a scope guard the console mode flag is now evaluated in all
cases. The code to display those messages got refactored into dedicated
methods which now also take care of console mode.
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