Ability to delete all generation history but still keeping all the favorite generations.

It would be really nice and very useful to be able to delete all generations from history butt still keep those that are in the favorites. That it would be a one or two click process. Delete all the things you don't need and keep the things you do need. 

→ Delete all generationhistory → Delete all history except favorites →  Are you sure…. confirm action

                                                 → Delete all history including favorites → Are you sure…. confirm action

Since we are currently at an unlimited plan we generate a lot of video for our projects, and the storage runs out quickly. So we would like to keep the ones that work in the favorites folder and then delete everything else when we start a new project. So that the entire generation history is only for one project at a time + our favorites. Otherwise it would be very time consuming (= expensive) when we always need to do it by hand. 

Hopefully can't see this features soon arrive in firefly.