Ability to set the maximum history length

[tim-hitchins-elucidat]

Hi - great app so far, has been working well on macOS.

It would be helpful for me to be able to limit the history - either by time or by total number of items, or both!

While 10,000 is impressive, it's a concern that I could end up keeping potentially sensitive information for longer than I want. In some ways the 100 limit would actually be best! Alternatively, clearing items after some duration would be good.

Thanks!