Added TSnippetList.ToIDList helper method to convert snippet list to ID list. This is to help transition from TSnippetList to ISnippetIDList.
Replaced custom "fudged" code in FrOverview and UDialogMgr units with call to new ToIDList.
Authored by: delphidabbler 2013-11-27
Parent: [r3971]
Child: [r3973]
