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Start Guard by evaluating the `Guardfile`, initializing declared Guard
plugins and starting the available file change listener.
Main method for Guard that is called from the CLI when Guard starts.

- Setup Guard internals
- Evaluate the `Guardfile`
- Configure Notifiers
- Initialize the declared Guard plugins
- Start the available 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 [String] watchdir the director to watch
@option options [String] guardfile the path to the Guardfile
@see CLI#start
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