Added lots of items, and an Enemy concept

Added lots of items, so we're optimizing for something other than the
threeish items we had before. Also tried to add some semblance of an
"Enemy" concept. Still not sure how to deal with it gracefully, or
worse, deal with teamfight heuristics, etc.
Added more items

...and now, my program wants to take three seraphs embraces. This
implies there is a bug somewhere, because three seraphs? Why not three
deathcaps? Time to teach my program to exaustively show its work.
Added more items