Fixes 2 broken custom items, adds 1 new one

Fixes hazard hardsuit icon_state, paper icon_state missing for an item,
removed krinn_hatt from obj/clothing/hats.dmi since it's defined to be
in custom_items.dmi and added MiT labcoat
Typo
Merge pull request #5942 from Jarcolr/customs

Fixes 2 broken custom items, adds 1 new one and removes duplicate icon_state file