Generic file-importer can be asked which extensions are supported. Added
that function to Core.scl.
refs #7154
Change-Id: If9d76c61e19ea543eda9ee23524d18c5d4623ee3
performFileImport :: String -> String -> <Proc> String
importGenericFileWithExtension :: String -> String -> <Proc> String
importGenericFileWithExtensionAndParent :: Resource -> String -> String -> <Proc> Resource
+ filterSupportedExtensions :: String -> <Proc> [String]
importGenericFileToResource :: String -> String -> <Proc> Resource
importGenericFileToResource path extension = do