Bug 325852 Add description attribute to MPartDescriptor/MPart
Adding this new attribute we could e.g. show additional informations about a Part in Show View-Dialog, ...
bundles/org.eclipse.e4.ui.model.workbench/src/org/eclipse/e4/ui/model/application/ui/basic/impl/PartImpl.java
@Override
	public boolean eIsSet(int featureID) {
		switch (featureID) {
			case BasicPackageImpl.PART__CONTRIBUTION_URI:
				return CONTRIBUTION_URI_EDEFAULT == null ? contributionURI != null : !CONTRIBUTION_URI_EDEFAULT.equals(contributionURI);
			case BasicPackageImpl.PART__OBJECT:
				return OBJECT_EDEFAULT == null ? object != null : !OBJECT_EDEFAULT.equals(object);
			case BasicPackageImpl.PART__PERSISTED_STATE:
				return persistedState != null && !persistedState.isEmpty();
			case BasicPackageImpl.PART__CONTEXT:
				return CONTEXT_EDEFAULT == null ? context != null : !CONTEXT_EDEFAULT.equals(context);
			case BasicPackageImpl.PART__VARIABLES:
				return variables != null && !variables.isEmpty();
			case BasicPackageImpl.PART__PROPERTIES:
				return properties != null && !properties.isEmpty();
			case BasicPackageImpl.PART__LABEL:
				return LABEL_EDEFAULT == null ? label != null : !LABEL_EDEFAULT.equals(label);
			case BasicPackageImpl.PART__ICON_URI:
				return ICON_URI_EDEFAULT == null ? iconURI != null : !ICON_URI_EDEFAULT.equals(iconURI);
			case BasicPackageImpl.PART__TOOLTIP:
				return TOOLTIP_EDEFAULT == null ? tooltip != null : !TOOLTIP_EDEFAULT.equals(tooltip);
			case BasicPackageImpl.PART__LOCAL_LABEL:
				return LOCAL_LABEL_EDEFAULT == null ? localLabel != null : !LOCAL_LABEL_EDEFAULT.equals(localLabel);
			case BasicPackageImpl.PART__LOCAL_TOOLTIP:
				return LOCAL_TOOLTIP_EDEFAULT == null ? localTooltip != null : !LOCAL_TOOLTIP_EDEFAULT.equals(localTooltip);
			case BasicPackageImpl.PART__LOCAL_IMAGE:
				return LOCAL_IMAGE_EDEFAULT == null ? localImage != null : !LOCAL_IMAGE_EDEFAULT.equals(localImage);
			case BasicPackageImpl.PART__HANDLERS:
				return handlers != null && !handlers.isEmpty();
			case BasicPackageImpl.PART__DIRTY: