Allow Model list to show under Groups within Explorer frame

This was a feature in ARIS Designer/Architect and was not preserved in Connect. When a Group is expanded within the Explorer frame, show the Models under that Group on the left. This is important, as it would allow the selection (vs opening) of a Model to see object occurrences on the right. As it is, each model has to be opened individually to see the contents.

Needed for complex modeling tasks like the re-use of objects from one or more models into one or more other models.

Being able to see the contents in a list (without having to navigate, zoom in, zoom out, etc. in the case of larger models) is more efficient than opening all relevant models.

Another approach would be to show the object occurrences int the “Details” pane. So a user would select a Group on the left, see the contained Diagrams in the middle and then have the ability to interact with the Objects contained in a subsequently-selected Diagram on the right.