Bug 317423 [Model] Get rid of the AbstractContainers like PartDescriptorContainer, ...
Some of the containers we defined where solely used by Application and our old Model-Contribution story and hence are "useless" now: * PartDescriptorContainer * BindingTableContainer Stuff I'm unsure why we have containers are: * TrimContributions * MenuContributions * ToolBarContributions but to me it looks like they are only used by Application-class so beside that I guess they are abstract, right?
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/menu/impl/MenuPackageImpl.java
* @see org.eclipse.e4.ui.model.application.ui.menu.impl.MenuPackageImpl#getTrimContributions()
	 * @generated
	 */
	public static final int TRIM_CONTRIBUTIONS = 23;
	/**
	 * The feature id for the '<em><b>Trim Contributions</b></em>' containment reference list.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int TRIM_CONTRIBUTIONS__TRIM_CONTRIBUTIONS = 0;
	/**
	 * The number of structural features of the '<em>Trim Contributions</em>' class.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int TRIM_CONTRIBUTIONS_FEATURE_COUNT = 1;
	/**
	 * The meta object id for the '{@link org.eclipse.e4.ui.model.application.ui.menu.ItemType <em>Item Type</em>}' enum.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see org.eclipse.e4.ui.model.application.ui.menu.ItemType
	 * @see org.eclipse.e4.ui.model.application.ui.menu.impl.MenuPackageImpl#getItemType()
	 * @generated
	 */
	public static final int ITEM_TYPE = 24;
	/**