Bug 149617 Support Content-type-based editor lookup
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/ReportPlugin.java
return convert( getPreferenceStore( ).getString( LIBRARY_PREFERENCE ) );
	}
	/**
	 * Set default library preference
	 */
	public void setDefaultLibraryPreference( )
	{
		getPreferenceStore( ).setDefault( LIBRARY_PREFERENCE, "" ); 
	}
	/**
	 * Return default library preference as an array of Strings.
	 * 
	 * @return String[] The array of strings of default library preference
	 */
	public String[] getDefaultLibraryPreference( )
	{
		return convert( getPreferenceStore( ).getDefaultString( LIBRARY_PREFERENCE ) );
	}
	/**
	 * Return default template preference
	 * 
	 * @return String The String of default template preference
	 */
	public String getDefaultTemplatePreference( )
	{
		return getPreferenceStore( ).getDefaultString( TEMPLATE_PREFERENCE );
	}
	/**
	 * set default template preference
	 *