[Mythic Feat] Expanded Arsenal - Hex

[gdsdougherty]

Since there's fewer ways to expand the witch (and shaman etc.) hexes, and a dc based shaman / witch would be focused on at least one school of magic, it seems like an obvious fit to add an Expanded Arsenal feat for hexes. Wouldn't need to be part of the dropdown since it's not technically a school of magic, I would imagine it being it's own standalone mythic feat would make sense.