Retain hierarchy for project in Gantt for Summary views

Project hierarchy will now be retained in a summary view, as we heard from our users that it is more helpful to see the parent/child relationship than to just see the projects listed alphabetically.

This hierarchy will be maintained when the view is set to "Group by > Project" in Gantt view. From there, parent projects will be ordered alphabetically, with child projects ordered alphabetically under the parent.

Thank you to Bree at Coola for requesting this feature!