Bug 152828 Add the projectFolder property on module
When user doesn't set the resource folder path in designer, there should be a default working path for Birt to manage the report design and find the related resources. A new property should be added on Module: name: projectFolder type:URL This property only can be given from the open design method from session but should not be set after the module initialized. Concern about the backward compatiblity issue, a new method will be added. Open design with a config argument.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignSession.java
* 
	 * @return the instance of <code>IAbsoluteFontSizeValueProvider</code>
	 */
	public IAbsoluteFontSizeValueProvider getPredefinedFontSizeProvider( )
	{
		return fontSizeProvider;
	}
	/**
	 * Set the instance of <code>IAbsoluteFontSizeValueProvider</code>.
	 * 
	 * @param fontSizeProvider
	 *            the fontSizeProvider to set
	 */
	public void setPredefinedFontSizeProvider(
			IAbsoluteFontSizeValueProvider fontSizeProvider )
	{
		this.fontSizeProvider = fontSizeProvider;
	}
	/**
	 * Returns the locale of the current session.
	 * 
	 * @return the locale of the current session
	 */
	public ULocale getLocale( )
	{
		return locale;
	}
	/**
	 * Informs this session some resources is changed. Session will check all
	 * opened mudules, all interfered modules will be informed of the changes.