FMagicDurMagBaseCostMult

This setting seems to have a broad effect. I have not yet found out what exactly the different effects are, but expect the following:

- prices on vendor-spells will change significantly

- duration on potions will increase / decrease

- it will be cheaper / more expensive to make custom spells or enchantments

- spells / enchantment will take less / more magicka (not confirmed)