Cull Item Variants on save, export and item copy

[Regisle]

This culls an item so that the list of variants, as well as any mods with unused variants with unmodified ranges are not saved in the item raw

This cuts down the storage of these items, particularly things like watchers eyes and forbidden jewels, and makes it much easier to copy/paste them in places with limited text space

an example of a culled item:

Rarity: UNIQUE
Watcher's Eye
Prismatic Jewel
Variant: RebuildCulledVariants
Selected Variant: 86
Selected Variant Name: Vitality: Life Recovery Rate
Selected Variant Last Legacy Variant: Vitality: Life Recovery Rate (Pre 3.12.0)
Prismatic Jewel
Has Alt Variant: true
Selected Alt Variant: 86
Selected Alt Variant Name: Vitality: Life Recovery Rate
Selected Alt Variant Last Legacy Variant: Vitality: Life Recovery Rate (Pre 3.12.0)
Has Alt Variant Two: true
Selected Alt Variant Two: 101
Selected Alt Variant Two Name: Zealotry: Maximum ES Per Second To Maximum ES Leech Rate
Selected Alt Variant Two Last Legacy Variant: Zealotry: Maximum ES Per Second To Maximum ES Leech Rate
Limited to: 1
Implicits: 0
{range:0.5}(4-6)% increased maximum Energy Shield
{range:0.5}(4-6)% increased maximum Life
{range:0.5}(4-6)% increased maximum Mana
{variant:86}{range:0.5}(10-15)% increased Life Recovery Rate while affected by Vitality
{variant:101}30% increased Maximum total Energy Shield Recovery per second from Leech while affected by Zealotry

This will not cull an item if any of the mods have been modified as it causes complications when reconstructing the item, and also updates the item if the unique gets updated with new variants
such that if its a generated unique it will find variants with the same name (if it can) and set the variant number to that, and if a new legacy version of a used variant is introduced it will set the variant to that instead

[Regisle]

This will conflict with #5680 as they both mess with variants, that one should probs be merged first and this one rebased off that, so for now Ill put this in draft