CVD machine and diamond swords

These changes add some new options for high-end crafting of melee weapons. Currently, the katana can easily be found in pawn shops, and once obtained remains useful even in the very late-game.

This adds a minimally improved version of several common weapons (knife, machete and katana) but made of diamond. Crafting them requires being near a CVD (chemical vapour deposition) machine, found in 1-of-7 labs (new terrain type and tweaks to the crafting system to allow usage from map). This could later be used to allow creating other high-end synthetic materials (superalloy, maybe?). The recipe to create the weapons is only found in labs.