Introduce option "Pasted items jump to the top"

[matthewpipes]

This discussion is in reference to #77 and #1131, but I'm opening it because I also had confusion with this. I couldn't understand why my most recent paste was at the top when I had it sorted by time of last copy. After searching I found those 2 issues.

The "solution" provided is to instead sort by time of first copy, but this isn't elegant. I may copy something, and then come back later and copy it again but this time it wouldn't show up at the top of the list like I would want it to, because it was already previously copied. I want my most recent copy at the top, regardless of what I just pasted.

IMO this behaviour should be disabled by default with an option to toggle "Pasted items jump to the top"