Adds switchtools and the swiss army knife.

Created by: ComicIronic

Come in three flavours: engineering, surgery, and Swiss Army Knife. Switchtools can store multiple items and let you deploy one to use on shit. Use a screwdriver to remove items and add new ones. No way to obtain them currently. Includes a new sound. Adds strike-anywhere matches which can be struck anywhere (except mobs). Edited chiselling a wall to use a do_after. Edited click code so preattack overrides the other procs. Made optables and racks use drop_item properly.