Bug 152834 support HTML description of the template
The template descrition is a fragment of HTML, use that fragment to render the template in HTML.
engine/org.eclipse.birt.report.engine.emitter.html/src/org/eclipse/birt/report/engine/emitter/html/HTMLReportEmitter.java
port.engine.content.IContainerContent;
import org.eclipse.birt.report.engine.content.IContent;
import org.eclipse.birt.report.engine.content.IDataContent;
import org.eclipse.birt.report.engine.content.IElement;
import org.eclipse.birt.report.engine.content.IForeignContent;
import org.eclipse.birt.report.engine.content.IGroupContent;
import org.eclipse.birt.report.engine.content.IHyperlinkAction;
import org.eclipse.birt.report.engine.content.IImageContent;
import org.eclipse.birt.report.engine.content.ILabelContent;
import org.eclipse.birt.report.engine.content.IListBandContent;
import org.eclipse.birt.report.engine.content.IListGroupContent;
import org.eclipse.birt.report.engine.content.IPageContent;
import org.eclipse.birt.report.engine.content.IReportContent;
import org.eclipse.birt.report.engine.content.IRowContent;
import org.eclipse.birt.report.engine.content.IStyle;
import org.eclipse.birt.report.engine.content.ITableBandContent;
import org.eclipse.birt.report.engine.content.ITableContent;
import org.eclipse.birt.report.engine.content.ITableGroupContent;
import org.eclipse.birt.report.engine.content.ITextContent;
import org.eclipse.birt.report.engine.content.impl.RowContent;
import org.eclipse.birt.report.engine.css.dom.CellMergedStyle;
import org.eclipse.birt.report.engine.css.engine.value.birt.BIRTConstants;
import org.eclipse.birt.report.engine.emitter.ContentEmitterAdapter;
import org.eclipse.birt.report.engine.emitter.IEmitterServices;
import org.eclipse.birt.report.engine.executor.ExecutionContext.ElementExceptionInfo;
import org.eclipse.birt.report.engine.executor.css.HTMLProcessor;
import org.eclipse.birt.report.engine.i18n.EngineResourceHandle;
import org.eclipse.birt.report.engine.i18n.MessageConstants;
import org.eclipse.birt.report.engine.internal.util.HTMLUtil;
import org.eclipse.birt.report.engine.ir.DimensionType;
import org.eclipse.birt.report.engine.ir.EngineIRConstants;
import org.eclipse.birt.report.engine.ir.ExtendedItemDesign;
import org.e