Implement sorting based on hierarchy

There are many areas of AHA where we would like to see items sorted based on their order of appearance in our hierarchy. In the Features roadmap, for example, products and their releases can only be sorted by date (and then name). In the GANTT view, the order of products (down) is also not the same as their order of appearance in the hierarchy. We would like to see the hierarchical sort order reflected in many more areas of AHA where sorting of workspaces or releases is involved.