Massively deprioritize item recently studied

This is more of a fail safe to make sure the same item doesn't appear
twice in a row. If this starts to effect sorting speeds then it should
be removed.
Added back ability to clear rune prompts

It still works by pressing and holding in the same location. If you move
the input while holding it shouldn't clear. This is needed so that it
doesn't clear for people who write too slowly.