An initial addition to add Golden Light (to do_yellowray) and four Smithsness Items

This is my first stab at a commit here.

1. I'm unsure if the if/endif handling on Golden Light works properly (I'm a lua novice) - it works great for me, but I'm totally wary on whether a Golden Light and an unbearable light will get used if both are in inventory (a rare case, indeed)

2. I added 4 items, positioning them in the default items lists based on (my interpretation) of their relative strengths in the order. (Generally, behind the astral items and Boris/Jarlsberg preferred items)