* ImportInfo no longer needs filepath for constructing IFileImporter instances. * GuiImportHandler now takes available ImportInfo instances and uses them as alternative source of importers. * PluginBase extended with virtual method to provide available ImportInfo instances. Related to Issue [WTI-497] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@4970 5a3db67b-de53-47b5-99c8-a1c30a6650e2