[Suggestion] Add masks to Void Fortress Armour

[JoshieGemFinder]

One of the main appeals of Thaumium Fortress armour was the ability to customize the mask (and as a extra bonus, a little defence boost from it) and the effect the armour has, and not having that was a little disappointing to me.

(The warp reduction mask would probably be a reasonable exclusion here, seeing as Void Fortress benefits from permanent warp)