Add possibility to auto-remove entries #25
Description
It'd be practical to have an option to set a max time after which an entry is being automatically removed if it isn't pinned.
Eg. I set it to three days and every thing I copy gets removed from the snippets after three days from the initial copying have passed.
Especially since you're not even able to use entries older than a few days without Planck Max and would have to manually delete them to make space for new ones if you happen to anytime have reached the maximum of copies possible.