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Initializes the Guard singleton:

* Initialize the internal Guard state;
* Create the interactor
* Select and initialize the file change listener.

@option options [Boolean] clear if auto clear the UI should be done
@option options [Boolean] notify if system notifications should be shown
@option options [Boolean] debug if debug output should be shown
@option options [Array<String>] group the list of groups to start
@option options [Array<String>] watchdir the directories to watch
@option options [String] guardfile the path to the Guardfile

@return [Guard] the Guard singleton
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