* Introduced ObservableList class ** This collection is now used to store PipingSurfaceLine instances for PipingFailureMechanism * Added thread-safe asynchronous Control calls for tree view and property grid controls triggered by observable notification in import thread. * Introduced PipingNodePresenterBase to reduce code duplication * Created node presenter for PipingSurfaceLine Related to Issue [WTI-20] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@318 5a3db67b-de53-47b5-99c8-a1c30a6650e2