Activities.el (new package for "workspace" management)

FYI, I’m testing a new branch that adds a feature to automatically kill buffers associated with an activity when suspending it. It seems to work, but I’d like to get a bit more testing before merging. If you’re interested, please see: Add: (activities-kill-buffers) etc. by alphapapa · Pull Request #36 · alphapapa/activities.el · GitHub