ref #6925 Inject context into operations to allow sync/async execution
ref #6913 Remove org.eclipse.ui dependency from AbstractUtility
ref #6913 Remove org.eclipse.ui dependency from NavigationUtil
ref #6598 Fix menu item visibility
ref #6909 Add missing @Execute annotation
ref #6909 Hide disabled menu items
ref #6909 Implement menu item/handler visibility
ref #6909 migrate taxon navigator context menu