This interface represents a wizard which will be used to add plug-ins to
the Target Platform. Typically, it maps to one wizard page, but more
complex sections may span several pages. Also note that in the very simple
cases it may not contribute any wizard pages.
This interface is not intended to be extended by clients.
Returns an array of locations which contain plug-ins to be added to
the Target Platform. If a location contains a "plugins" subdirectory,
the subdirectory will be searched for plug-ins. Otherwise, the location
itself will be searched for new plug-ins.
an array of Files which represent the locations to search for