Merged revision(s) 8159-8192 from branches/WTI-1093: added UpdateInfo and methods required to generalize the add update item to context menu. ........ moved resources moved responsibility of getting file path to GuiImportHandler ........ extracted common logic ........ Extracted separate GuiUpdateHandler. Added AddUpdateItem and CreateUpdateItem for context menu builder and factory. ........ Added IInquiryHelper responsible for obtaining information from the user. Implemented DialogBasedInquiryHelper responsible for obtaining information through the use of dialog boxes. Removed unused TestStochasticSoilModelChangeHandler. ........ Extracted classes. Added documentation. ........ Set dialog parent for message box. Added tests for DialogBaseTest to verify parent set. ........ used inquiryHandler in StochasticSoilModelChangeHandler ........ unused ref ........ Related to Issue [WTI-1093]