Added support for item sets.

game/modules/tome/class/Actor.lua

game/modules/tome/class/interface/ActorObjectUse.lua

game/modules/tome/data/general/objects/world-artifacts.lua

...ules/tome/data/talents/chronomancy/timeline-threading.lua

game/modules/tome/data/talents/corruptions/plague.lua

game/modules/tome/data/talents/cursed/darkness.lua

game/modules/tome/data/talents/cursed/strife.lua

game/modules/tome/data/talents/gifts/storm-drake.lua

game/modules/tome/data/talents/gifts/venom-drake.lua

game/modules/tome/data/talents/misc/horrors.lua

game/modules/tome/data/talents/misc/npcs.lua

game/modules/tome/data/talents/misc/objects.lua

game/modules/tome/data/talents/misc/races.lua

.../modules/tome/data/talents/psionic/augmented-mobility.lua

game/modules/tome/data/talents/spells/aether.lua

game/modules/tome/data/talents/spells/meta.lua

game/modules/tome/data/timed_effects/magical.lua

game/modules/tome/data/zones/demon-plane/npcs.lua

game/modules/tome/data/zones/demon-plane/objects.lua