Arrow Recovery

A 1-line fix which makes it so that arrows will drop 2.22 metal bits when they break, allowing you to recycle the metal into more arrows.
The drop rate was set where it was set so that on average you won't gain or lose any metal by recyling your arrows, it will be recovered.
If you have a smithing recipe which makes more than 9 arrows per ingot, you might want to tweak the return rate down a bit or you'll get overunity.

Flint and Stone arrows obviously won't give any drops because there is no such thing as a flint or stone metal bits but if you add metal bits of those types it will work.
Steel bits can't be smelted into steel ingots because I guess the developers forgor to add steel recycling in the bloomery like they did with iron.