Add Mythic and Non-Mythic to various IWR cases

[TheErikkuBlade]

While Mythic is present in resistances, non-mythic is no where to be seen for resistances or immunities (which is relevant to mythic immunity) and mythic is not present in exceptions for Immunities (which would be an alternative for Mythic Immunity). Would be nice to add non-mythic to doubleVs Resistances too, for people wanting to homebrew but I don't recall anything official with this.