Bug 151361 default value for reousrce folder user preference
When user does not sepecify the resourec foler user preference, can we make the current project folder (in IDE) or the current report design file's folder (in RCP) as the default value for the resource folder. This way, by default the current project folder is the resource folder where user can create their libs and images. Also please set the default user preference to be null when BIRT is freshly installed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/ReportPlugin.java
preference.append( PREFERENCE_DELIMITER );
	}
	/**
	 * Get default element name preference
	 * 
	 * @return String[] the array of Strings of default element name preference
	 */
	public String[] getDefaultDefaultNamePreference( )
	{
		return convert( getPreferenceStore( ).getDefaultString( DEFAULT_NAME_PREFERENCE ) );
	}
	/**
	 * Get default custom name preference
	 * 
	 * @return String[] the array of Strings of custom element name preference
	 */
	public String[] getDefaultCustomNamePreference( )
	{
		return convert( getPreferenceStore( ).getDefaultString( CUSTOM_NAME_PREFERENCE ) );
	}
	/**
	 * Get default description preference
	 * 
	 * @return String[] the array of Strings of default description preference
	 */
	public String[] getDefaultDescriptionPreference( )
	{
		return convert( getPreferenceStore( ).getDefaultString( DESCRIPTION_PREFERENCE ) );
	}
	/**