Bug 146208 ActionBarContributor Enhancement
Use MultiPageEditorActionBarContributor instead of EditorActionBarContributor to support more multi-page feature.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/DesignerActionBarContributor.java
package org.eclipse.birt.report.designer.internal.ui.editors;
import java.util.List;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.AddGroupAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.AddStyleAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.CreatePlaceHolderPartAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.InsertColumnLeftAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.InsertColumnRightAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.InsertRowAboveAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.InsertRowBelowAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.MergeAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.RevertToReportItemPartAction;
import org.eclipse.birt.report.designer.internal.ui.editors.schematic.actions.SplitAction;
import org.eclipse.birt.report.designer.internal.ui.extension.ExtendedElementUIPoint;
import org.eclipse.birt.report.designer.internal.ui.extension.ExtensionPointManager;
import org.eclipse.birt.report.designer.internal.ui.views.actions.ImportCSSStyleAction;
import org.eclipse.birt.report.designer.internal.ui.views.actions.ImportLibraryAction;
import org.eclipse.birt.report.designer.nls.Messages;
import org.eclipse.birt.report.designer.ui.actions.ApplyStyleMenuAction;
import org.eclipse.birt.report.designer.ui.actions.EditGroupMenuAction;
import org.eclipse.birt.report.designer.ui.actions.EditStyleMenuAction;
import org.eclipse.birt.report.designer.ui.actions.GeneralInsertMenuAction;
import org.eclipse.birt.report.designer.ui.actions.InsertGroupMenuAction;
import org.eclipse.birt.report.designer.ui.actions.MenuUpdateAction;
import org.eclipse.birt.report.designer.ui.actions.NewDataSetAction;
import org.eclipse.birt.report.designer.ui.actions.NewDataSourceAction;
import org.eclipse.birt.report.designer.ui.actions.NewParameterAction;
import org.eclipse.birt.report.designer.ui.actions.NoneAction;
import org.eclipse.birt.report.designer.ui.actions.ToggleMarginVisibilityAction;
import org.eclipse.birt.report.model.api.DesignEngine;
import org.eclipse.birt.report.model.api.metadata.IElementDefn;