Adds recipe to create metal flasks at the forge.
Adds an optical cloak, powered by UPS, that can render the user invisible.
Fix optical cloak json seperators. Fix incorrect price.
Add waterproof flag to cloak, decrease warmth, and increase environmental protection.
Speed up crafting can_make function, by not assigning an invlet when enumerating the items at crafting distance
Merge stuff. And things. And el-rapido craftmenu(tm)