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/descriptor/basic/impl/BasicPackageImpl.java
* @ordered
	 */
	public static final int PART_DESCRIPTOR__TOOLTIP = UiPackageImpl.UI_LABEL__TOOLTIP;
	/**
	 * The feature id for the '<em><b>Handlers</b></em>' containment reference list.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int PART_DESCRIPTOR__HANDLERS = UiPackageImpl.UI_LABEL_FEATURE_COUNT + 0;
	/**
	 * The feature id for the '<em><b>Binding Contexts</b></em>' attribute list.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int PART_DESCRIPTOR__BINDING_CONTEXTS = UiPackageImpl.UI_LABEL_FEATURE_COUNT + 1;
	/**
	 * The feature id for the '<em><b>Element Id</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	public static final int PART_DESCRIPTOR__ELEMENT_ID = UiPackageImpl.UI_LABEL_FEATURE_COUNT + 2;
	/**
	 * The feature id for the '<em><b>Tags</b></em>' attribute list.
	 * <!-- begin-user-doc -->