Remove iuse::scissors and the scissors specific use_action. It was used for one thing and was essentially duplicate code for the cut action found in the iuse::knife.

I would like to make scissors be special in some other way (the more I think about tailoring, the more it seems odd just how much we can do with only needle, thread, and rags). But for the interim of this pull request, scissors will act like knives of equivalent cutting quality.