When using an array-form for additional damage parts in an enchantment, allow for multiple damage types

[krbz999]

While possible when using system.damage.parts | Add | {types: [...], number: 1, denomination: 6}, it would be good if multiple damage types could also be allowed in the array form such as:

system.damage.parts | Add | [["1d6", ["acid", "cold", "fire"]]]

[arbron]

I doubt we will be adding improvements to the array form since it is only there for backwards compatibility.