Arrowheads Recovery fork

A slightly different take than OmegaHaxors's Arrow Recovery (broken arrows drop metal nuggets) and IvanZS's Arrowhead Recovery (all broken arrows drop arrowheads), this mod makes it so that broken flint/copper/bronze/silver/gold arrows behave as in vanilla, iron/meteoric iron/steel arrows behave as in Arrowhead Recovery.

This is a minor tweak that I made for myself but figured maybe other people might share the mindset and enjoy the mod as well.

The reasoning behind this mod is the following:

• I thoroughly enjoy casting low grade metal arrows with the More Molds mod and don't mind losing the metal. It's sufficient for reloading on arrows in an under-equiped outpost far away.
• Smithing iron or steel arrows is a large time investment and requires a proper infrastructure (windmill + helve hammer + high tier anvil) even with Knapster and should last long as a result.