LT-15851: Display All Referenced Complex Forms in Stem-based

- Add All-Complex-Forms getter to ILexSense and ILexEntry.
- Update Stem and Bart configs
- Make IsCollectionType better meet our needs
- Enhance ConfigurableDictionaryNode.ToString

Change-Id: I203b2160ea4afbd0e99ac9e598421b8fecf3d69f