Move all activities back an hour#131

It would be helpful to be able to select already scheduled activities and routines and bump them all an hour back, for example. Sometimes I forgot I had a meeting and need to move things down, or something gets cancelled and I want to move things up. It’s really tedious to have to go into each activity and change the time.

This would be so helpful! (Shifting all scheduled activities forward or back by a set amount of time.)