kilns can be made indoors now

added building material crafting to a few other researches to hopefully fix an issue where building material could not be crafted

carbon drills now produce carbon correctly

parchment is made with animal skin, not leather

added carbon drills and fixed oil drill 2 research

added chainmail sheets to the refinery and a research to unlock it at tech 6.

added hybrid iron and copper mines, swapped existing stone hybrid mines for new recipe version (unintended to leave the vanilla unlocks)

i forgor to set operators to 0

added individual automated refineries for iron, copper, steel, spring steel, adv alloys.

fixed Medical Workbench II not upgrading to III