* Moved commonly created helper method in IFileImporters for calling ProgressChanged to FileImporterBase. * Implemented progress notification for ReferenceLineImporter. Related to Issue [WTI-364] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@2188 5a3db67b-de53-47b5-99c8-a1c30a6650e2